I was just about to go to bed but refreshed the page before turning the computer off, and, babyh, obviously I can't leave you unanswered - I'm so sorry, poor poor you, you've been having a really rough few days. I wish it had been a BFP for you
Please, please don't ever beat yourself up for finding this hard - yes, you have two beautiful living children, but they don't make up for A's death, and we all understand the need to have another little one in your arms.
I COMPLETELY get the stress about AF/cycles. I am also in a really irregular pattern now (for me it's more the opposite, I have had lots of bleeds, but given some post-birth complications, I have had no idea which were AF and which were the consequences of the operation I had to have a month after E was born. I think I have ovulated now and am waiting to see what sort of LP I have. It's so very stressful, I do understand - like you, we just want at least this one thing to be normal...).
Anyway, enough about me. Based on my own knowledge - you might have to expect some more irregularities. You might not, of course, but the stress of A's death will mean that you're producing different amounts of hormones to usual, and this might mean you're not so regular for a while. I'm not sure whether you have just had an AF; to me it sounds like maybe you didn't... (in my uneducated opinion!). Oh and I get random period pains at the moment too, not at the time of bleeding, but eg I had them during the week I ovulated... no bleeding, just pains... it's so difficult to interpret them, isn't it? I think it's just another weirdness and am trying to base my ideas of cycles on actual bleeding and temping, nothing else. (Have you thought about temping?)
I really wish I didn't need my CBFM at the mo - I'm about to start re-using it after this cycle - otherwise I would send it to you!! It's much more reliable than ovulation sticks, if you really really want to track your cycle properly. Have a look on ebay, as they are quite expensive from new (I was on there the other day after the lovely blizy's recommendation to get the CBFM sticks on there). Secondhand ones can just be re-set and then you start using them as if they were new, but you need to use it from the first day of AF.
If it helps - when we had no clue if I was cycling or not - we SWI'd every other day, just in case. Also, DH and I have decided that, if I'm irregular for a while, we're going to try to view it as extra time for my body to heal rather than getting even MORE stressed about it. I can't say I'm always successful with this, but it does help a bit.
Sorry, this was mostly about me, but I wanted to share in the hope that it might help.
too Happy Birthday to you! I am so pleased you had a nice day and that you got such a lovely birthday card from both your girls xx