So, it's been ten weeks since my last period. My periods before that started getting later, arriving on day 37 then 45. I've taken 7 pregnancy tests, all negative. The last pregnancy test I took was a week ago. I don't have any pregnancy symptoms, except the missing period. The other things that could be messing with my period are antibiotics I took for a UTI 2 weeks after my last period, I'm a smoker (been smoking for 7 months now), excessive stress, weight gain, etc. Any comments from you guys? Of course I'm still wondering if I could be pregnant...