Hello. I got my birth control placed in my arm in December of 2015. I had a period mid-january and I had a period for 2 and a half weeks. I was put on an antibiotic for a bladder infection I've been sexually active with my husband even when I was on the antibiotic. I was at the doctors office today and I weighted 11 pounds more than I did two weeks ago when I was there. But I eat right and exercise regualry so I don't see how I could have gained 11 pounds in two weeks I have still not had a period either so my question is, is there a possibly that I could be pregnant?