Hi all, I got my BFP yesterday (well three as I needed to check a couple of times). Anyway I came off the pill in June last year and haven't had a regular period since, they tend to be spaced far apart (I've only had 4 since June). My last period started on 11 Jan. The calculators say I'm between 5-8 weeks pregnant depending on what I set my cycle to. I'm so concerned about not knowing when I'm due or if everythings ok. I'm also getting a lot of cramps, like period pains but not as bad.
Get yourself booked in with your GP and your midwife, they will be able to let you know an estimated date. Then, you get yourself a 12 week (ish) scan, and they will do a dating based on size giving you a much better indication of your due date.
As MumOf3xx said, some pains are not unusual - it is impossible to say what they are about (could be implantation pains, or just things stretching) but as my rather pragmatic midwife said when I sadly had a miscarriage, there is nothing you can do about it, so try not to worry.