martha for you. There is the possibility that implantation bleeding can be 'period' heavy and not the spotting you mostly read about in articles... but that said, it could very well be another cp.
And I understand how heartbreaking it must be to get a bfp followed immediately by bleeding/loss but the thing is, how would a doctor get the sense that you need any testing done for reoccurant loss if you hadn't tested? Y'know, to go to a doctor and vaguely say 'wellllll, I think I may have been pregnant, but I came on on time' is quite different from 'following my mc, I have twice now gotten a bfp followed shortly by bleeding and bfn'. I suppose you've reached the three losses before testing threshold but none the less it may be more informative for the doctor doing your testing to know for sure you're having lots of very early losses (and looking for solutions in that direction) rather than maybe suspecting or not knowing at all. Despite how it feels in the short term, think about, on balance, how it may build a more accurate picture of what is happening if you do know rather than not.
Well, you know yourself better than I, and whether this is something you can do and I don't wanna bully be pushy but have a think about it?
Now! Wrt to supplements, yes, I would advise anyone ttc to take B100 - even if someone has NO issues, it has been proven to improve egg quality in ivf and, seriously, who doesn't want their egg to be in the best shape it can be? For the sake of a vitamin pill a day (admitedly, quite a big one) it's a little bit of a no brainer, right?
THe next thing I'm gonna say, I caveat by pointing out that I don't know as much as about this as I do other things I happily advise on... but it's regarding baby aspirin (ie, low dose). I've read of women who have reoccurant very early loss, having a battery of tests done that find nothing, and then the doctors suggesting they take baby aspirin as they're not sure exactly about the mechanism as to how it helps, but it can't hurt... and then these women hang onto the next pregnancy. As most people now realise, aspirin is a blood thinner, so perhaps the science of it is it works in a much milder way than the heparin women with 'proper' blood clotting issues have to take and improves the blood flow to the uterus, in turn making it more likely to help if there is a small, almost undetectable glitch going on with implanation. Again, I don't know an awful lot about it (did a little reading when my step sister was advised to take it, although she took until the end rather than just conception/first tri (she was 39 too!) as she developed GD and was prone to PE and somehow the low dose aspirin seems to help those conditions too). Perhaps have a little fish about on here/elsewhere - there are bound to be some good news stories and I suspect other reports of doctors saying 'it can't hurt'. And if it can't hurt, and anecdotally has helped others in your shoes...why not?
Lastly, I'm not entirely sure temping is for you. That is to say, I bloody love it; but I'm a control freak! It seems at the moment, you don't really have an issue catching the egg... which temping really helps you pinpoint. You're pretty sure of your cycle and when you ov... Many women find temping a real faff, even stressful, and that's not going to help you any. By all eans I'll happily spout temping advice and stalk your chart if you wanna give it a go anyway but... yeah, DO NOT let it stress you out. Counter productive!