That is a very personal and multifaceted question. Are you charting? If you chart for a cycle, you can tell how long your luteal phase is. Low progesterone is common during the return to fertility while breastfeeding and often results in short luteal phases. If your cycle is under 9 or 10 days, it is unlikely that you would end up pregnant (fertilization may occur, but your period would begin before implantation) even if you did TTC. It may take a little time, but your cycle will eventually regulate.
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If you want to push your cycle to regulate faster, many women have had success with vitamin B6, or you may choose to wait for it to regulate on its own. I chose to eat foods containing B6 such as bananas and yellowfin tuna. I don't know if it helped or if my body just clicked back into place on its own a month after I started targeting foods with B6.
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Women conceive all the time with iffy hormones initially, and they go on to have healthy pregnancies. In fact, it is quite common to conceive immediately after getting off of the BCP even though it takes most women some time for their hormones to regulate. For other women, their hormone imbalance is enough to create problems for trying to conceive. I can't tell you where you would be on that spectrum.
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Basically, there is a chance that it could not be a problem, and there is a chance that it could make conception or implantation difficult or impossible. I don't know what it would be for you. If you want to shoot for whatever chance you've got and TTC now, I wouldn't discourage you. If you want to wait and chart to give you more information, wait for your hormones to regulate, and increase your chances of getting pregnant, that is the choice I made.
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If you want to talk to your physician to get more information s/he would probably know more than I do about how this would affect your ability to get pregnant. If you go this route, I'd recommend a physician trained in NaPro technology because they tend to be the most knowledgeable about the connection between the signs in a woman's cycle and the affect that it has on your ability to conceive. Do know that in all likelihood, this is not a sign that there is something wrong with you, just the natural, normal return to fertility after childbirth. If not now, you should be able to conceive within the next several months.