Hi everyone.
It's nice to meet you all. I'm totally new to this (to Mumsnet and to pregnancy) so I'm a novice. It's really incredible to find this site and so many likeminded women in similar situations.
My situation: Just turned 30 and had been TTC unsuccessfully for 18 months. We were under hospital in our old hometown for infertility (I have PCOS, not ovulating, husband v low sperm count). Told in April we'd never conceive naturallY. Decided against treatment until life's settled down (in the last 2 months we've moved house to new part of country, husband's got new job, Ive had my finals of my MSc, lots of ill health and stress etc). Life's been so chaotic+stressful that I've recently had a nervous breakdown. I've been so unwell that I've not noticed my cycle lately (no IDEA when last period was and they're erratic anyway due to PCOS).... Anyway - just found out I'm PREGNANT!! 
Did 3 tests over weekend (all positive) and a GP test yesterday. GP just this second called to confirm!! Over the weekend I was distraught - it felt like the worst timing to get pregnant when so unwell and out of work. But now it's sunk in I'm over the moon!!!!! 
I just can't believe the strange karma of conceiving naturally after being told there was no hope and at a time of such high stress and ill health - surely the odds were stacked against conception??!
Anyway - there's no way of telling how far gone I am. I could be anything between 2-3 months! So I'm probably due April/May time too like you guys. Looking back, for 4 weeks I've had urinary urgency, abdo cramps, huge bosoms, sore nipples, tearfulness, aversion to most smells etc. I should've guessed!!
It'll be great hearing everyone's progress and making some friends (none of my friends have ever been pregnant and I'm living miles away from them so I'm a bit alone with all this). Really looking forward to sharing experiences.
I hope you're all well and really happy.
xx
ps - sorry to have waffled on! I do ramble.