I'm on birth control.. Took plan b several months ago. I don't have a very heavy period on bc but the last two months my periods have been very strange.. I have filled a tampon for3-4 days with dark stringy clots and bright red blood with mucus. I start when I should (when my inactive pills are) but my stomach feels bloated and funny when I push on it.. Maybe I'm still paranoid.. But lots of people on Internet sites say they have normal periods during pregnancy.. I have no symptoms.. I just don't think my stomach should be so bloated right after a period. Could I be pregnant?