I have irregular periods (can go up to 6 wks between them) and been taking my temp to work out ovulation, i ovulated on day 16 and am now 12 DPO have taken 2 HPT on 10 & 11 DPO (both NEG) Have very tender breast and nipples, am i pregnant or just getting my period? Also due to such irregular periods if i am pregnant when will a HPT show POSITIVE? I also suffer from Endometriosis which causes back pain and cramps quite a lot, which i have also been feeling a lot this month, but not sure if reading too much into it. I had an eptopic 2 years ago and so worried about it happening again. I am so deperate to be pregnant and been ttc for a year and getting myself into a right state about it, please HELP!! Thank you.xx