So I’ve been on the birth control pill for about 5 years now (same time I’ve been with my boyfriend). About 2 weeks ago he came inside me for the first time in over a year. 2 days later I started on antibiotics for a UTI. I’m not sure how well my birth control worked then. This past few days I’ve had really bad back pain and cramps, my period is due to come in 5 days but I’m scared because most months my PMS isn’t that bad. Could it be pms from my pill being thrown off by the antibiotics or do you think I could be pregnant?