Hi Savvy,
There is a lot still to be learned about how APS affects implantation. It was until recently not thought to cause problems at all so early, but we now know this is not true.
I am wondering though about your 'second miscarriage'. After a miscarriage it is common for the HCG levels to fall relatively slowly, and still be detectable in the blood up to 6 weeks later. So, if you never saw a gestational sac on ultrasound, or had a foetus 'found' in a tissue sample, it is soon enough after the first miscarrage that a low level HCG reading was simply a hang over from that first pregnancy, and that you have not just lost a second baby at all. Of course I don't know the details - how was this 'second' pregnancy diagnosed?
For clarity (especially in talking to your obstetrician), it would be helpful if you could use the standard terms for dating pregnancies.
The first day of your period is day 1, week 0
14 days later you ovulate. This is week 2
28 days after your last period is generally the first day of being 'late' for your period, and the first day you'll get a positive pregnancy test if you are pregnant. This is then week 4.
So when you say 16 days, I don't know exactly what you mean. At 16 days after a miscarriage, you couldn't possibly know you were pregnant again, as any new conception would have only happened 2 days ago and is too early to be producing HCG. I guess what you mean is that it was 16 days after ovulation that you started bleeding? Is that correct? In that case you were 30 days or 4 weeks and 2 days pregnant. But as I said earlier, if the only 'evidence' of a pregnancy was a hcg reading (was this confirmed by a blood test? I presume so as you said the level was very low, and a urine test doesn't give a numbers result), then it could have just been left over HCG from your first miscarriage.
Which of course doesn't make it any easier for you to get over, and is still a loss that needs grieving.
What ever the situation is, I suggest you talk to your obstetrician as soon as you can and find out as much as you can. Also ask if there are other tests you could have. For example a 'cycle analysis' migh be helpful. This is where blood is drawn at several points in the menstrual cycle to check that your hormone levels are normal. A low progesterone for example can cause infertility or early miscarriages because the endometrium fails to get ready enough to support the fertilised egg.
Does this help
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