The "period" in March was likely a hormonal bleed and not a true period if it happened in the first 56 days postpartum, and you were exclusively breastfeeding. Exclusive breastfeeding is a very effective (98-99%) method of child spacing in the first 6 months, and continuing to nurse on cue until your period returns is pretty darn effective. Different studies show that 5-10% of women will get pregnant before their first period while breastfeeding whenever it comes if they are doing nothing to prevent it (I see the 6% statistic the most). About 1/3 of women will not ovulate before their first "period" (not a true period if it's not preceded by ovulation), and another 1/3 will not have a long enough luteal phase to sustain a pregnancy, so only 1/3 of women would even have a possibility of getting pregnant before their first postpartum bleed (after 56 days).
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Getting pregnant at this stage would be pretty tricky. As a mother, you'll need to figure out how aggressively you want to pursue pregnancy at each point in the journey and how to balance the needs of the child that you already have. I'd like to give you some points to consider that you may or may not have heard already.
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-It is unlikely but possible that you are already pregnant. The changes in breastfeeding behavior that you are seeing could be related to your son growing, your cycle trying to return, or any number of other things. You can always test to find out.
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-Creamy CM is a sign that your body is working to ovulate, but your CM will likely become more clear and stretchy like egg whites before you actually ovulate. If you are trying to get pregnant, you may want to keep track of your CM and aim to DTD whenever you have CM, especially if you see a change toward more, more clear, or more stretchy CM.
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-Getting pregnant while breastfeeding will likely cause a decrease in milk supply over first 3 or so months and a complete or almost complete dry up of your supply around the start of the second trimester when the placenta begins making a lot more progesterone. Since a child under the age of 1 really needs to get most of his calories from breast milk or a breast milk substitute, if you got pregnant much before your child is a year old, it is possible that he would require some sort of supplement (previously pumped milk, donated milk, or some sort of formula), and if you got pregnant much before 9 months, it is almost certain that your so would require supplemental feedings so that he can get the majority of his calories from breast milk or a substitute at least until he is a year old.
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-There are no guarantees with breastfeeding when you become pregnant. Every mother-nursling pair experiences pregnancy differently. Many mothers experience nipple pain, though some not much at all. Some nurslings (especially if they are young and depending on it more for milk than comfort) wean when there is no more milk or when there are changes to the milk, and some mothers find that they are so uncomfortable that they need to wean. Some women lose their milk completely while others don't experience much drop in supply at all. Some women are surprised by feelings that they have about their nursling during pregnancy. It's really hard to predict what will happen. You might check out "Adventures in Tandem Nursing" by Hilary Flower to get an idea of what some other mothers have experienced so that you can get an idea of what to be ready for.
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-TTC while your fertility is returning can be quite a roller coaster ride. Many women spend months and months waiting for their periods to come back and then waiting for their cycles to become more fertile. They try out various different supplements to try to get their cycles to regulate. They worry month after month if their Luteal Phase will be long enough and face disappointment month after month. For some women, it is important enough to them to TTC ASAP that it is worth all the ups and downs, all the hopes and disappointments. Some women prefer to wait until they start having periods or even until they start having fertile cycles to start really trying, and some women do not experience all these ups and downs because they do get pregnant quite quickly. It's always possible, after all.
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-If you really feel like you need to push your body to allow you to get pregnant sooner than it would be ready to do on its own, there are some things that you can do. Gaining a few lbs over your pre-pregnancy weight, supplementing with Vitamin B6 (and many other options for supplements), reducing nursing secessions, night weaning, etc, may help your fertility to return. It's up to you to figure out what your child is ready for and how much you want to push your body.