Ive been sick for the past 3 weeks with nausea (some vomitting) cramping, and major exhaustion. I've been on birth control for several years had sex on 9/20 which would have been during ovulation. That week I began feeling really sick, I missed a pill on 9/23 but had already being feeling ill at this point. I took a pregnancy test sometime that week assuming it would be too early to know anything but couldn't wait (negative result). On 9/30 I began bleeding very lightly and it would have been a week before my period was normally due. Spotting lasted for 3 days and again got a negative pregnancy test. I went to the doctor on 10/5 because I had begun actually vomitting and feeling worse. They ran a few tests (mono, urine sample for UTI etc...) all came back negative. Was precribed Cipro for a possible UTI (turns out I didn't have a UTI). At this point I have stopped taking my birth control cause I'm not sure what is going on... Still feeling sick - Nausea, exhaustion, cramping, lower back pain every once in a while, frequent urination, and now my period is a week late. What could this be?