Can rough sex cause miscarriage. I bleed sometimes during or after sex and its not my period. I've been to the doctor and there's no infection, swelling or thrush. Its just I've thought a few times I was pregnant cos I was late + had symptoms, but before I had tests we've had rough sex + I've bled then got my period a few days later. I had a test today + it was inconclusive. I started My last period sat 28th April,ended on the 5th of may + I ovulated on the 12th of may + had sex twice that day. if rough sex can cause one,.I'll refrain from it for a bit.