Confused.....

Hi Ladies, I have been a bit of a lurker for the last few months. I came off the pill 3 months ago and got my first real af quite quickly. I have since had cycles between 26 and 27 days with between 8 and 10 dpo before af arrives. This month I am 13dpo and had horrendous pains between 10-12 dpo (similar to af pains but a little bit different), these pains have since stopped and today I feel completely normal. I have got bfn's at 10/12/13dpo. I am not sure if anyone else has experienced this as im a bit worried. Thanks ladies!