I am mostly just curious, as subsequent children tend to come earlier. Also knowing that this always is not the case, if my theory is correct, it could still mean nothing for when this baby will come.
That being said....
From when I hit puberty, I remember knowing that each month I would start a few days after I did the month before. THat was about all I knew. DD1 came as a surprise when I was 20. I was given an EDD of 4/16 based on LMP. She came 4/20. 9 yrs between DD1 and DD2. In between I didn't pay a lot of attention to my cycles. DD1 nursed 4 years and AF didnt show for 3 of those. I do know that my cycles were still a bit longer than a month, but never tracked and didn't know what it mattered. DD2s conception was easy, without charting help. EDD was 11/11 based on LMP. Went into labor with her 11/9 and she came a few min past midnight on the 10th.
So we decide to have baby #3. I had an IUD between #2 and #3, it came out around June. I had 1 period, then 40 days, then another. I started temping and tracking at this point as this was our first month to try. I got to day cd 18 with no temp change and no change to OPK. I scrapped em for a couple days, DH and I dtd daily just for kicks. I peed on my last OKP around 20 and had a a potential positive, but not sure if I had missed it or what.
I started testing on cd28, cd34 came and went, no BFP. We were bummed, had a pitcher or margaritas on a great date night and decided we would get em next month. I had a ton of tests so I kept peeing daily. Day 36, last test, BFP.
So based on this info, I am guessing that I probably have always ovulated well past the normal cd14. Does this sound accurate? And if that is that case, then if my OB for my pats two kids had come up with a true EDD based on ovulation, it would have been several days later than based on LMP, correct? Which would really mean that DD1 probably came on time and DD2 probably came many days early.
I ask because this time I adjusted my LMP date to tell the OB on when I thought I ovulated. Early sono matched that exactly to the EDD. So this new babe's EDD is based on a pretty accurate ovulation date I believe. Had they gone off true LMP, her EDD would have been a week sooner.
So I always thought that my DD1 came "late" and DD2 "right on time", but I now think that DD1 came "right on time" and DD2 came a week or so "early". And if the trend of subsequent kiddos coming a bit sooner holds true, then this babe could (in theory) come a good week before EDD. Now she could also come two weeks late and the whole story above would mean nothing, lol.
But mainly I am trying to make sense of my body and cycles and understand it all. Does the above make sense? It is late here and this thought just rolled across my brain.