Nauseous on and off through out the day since period ended

ever since the first day after my period ended, i have been nauseous on and off through out the day, but have not thrown up. it’s been 11 days now and the frequency of feeling nauseous just keeps getting worse. four days before that last period started, i did have unprotected sex, but thought nothing of it as i still ended up getting my period. now im anxiously awaiting for the 24th when my next period is supposed to start. i have also tried taking nausea medication to try to help but that just seemed to make it worse