Edited by 1babysmom - 3/19/13 at 6:26pm
Hi OP, I'm so sorry for your repeated losses! Did you test after your m/c to confirm that your hCG levels had gone down past the testing threshold? Was the m/c confirmed via u/s? Two thoughts that immediately popped into my head were that your hCG levels are still high from your previous pregnancy and that's what's causing the BFP OR that you're dealing with something like vanishing twin where you m/c one embryo, but not the other. Could either of these scenarios be possibilities?
If not, looking at your chart, I see that you marked your CP as HSC on the supposed day of O. This is not terribly likely. I also don't see any CF marked before or after that O day. Can you recall what was happening on any of those days? That could help us pinpoint better. Your chart does appear to have a vague biphasic pattern, but it's not blatantly obvious and considering you just had a late 1st tri loss, I would expect your temps to be quite erratic for a while. I see that prior to this last bleed your temps were in the high 97's, which is where they are now, suggesting that you are in fact in your LP. I suppose that CD13 is a possibility for O, but without CF or CP marked it's really hard to say. But that would put your BFP at 9DPO, which is certainly possible. Do you plan to get an early u/s for dating purposes? This is quite the mystery!
Ugh, that's expensive! Well at least you have a general window of likelihood, so I personally would just go with a due date around CD14, b/c a care provider will use your LMP and come up with that conception day anyway. Plus or minus 1-2 days isn't much. If you have a 20 week sono then you could move your due date later if necessary.