I've been on birth control for about 4 months now, and since then my periods have been really light and short (use to be complete opposite). I just finished my period 2 weeks ago, now i woke up to a very heavy flow. I've been feeling kind of sick lately, a few days ago i woke up and vomited, stomach pains (a bit different from cramps but similar?) and kind of bloated. I am sexually active if that matters. Just wondering if this is normal.