Had unprotected sex about 4 weeks ago and Friday night had sex and realised condom had split. We are not trying for a baby. Last night I had obvious period cramping and thought that's weird, I only came off my period a week ago and today I've started bleeding. I'm not on any contraception so my periods are every 4 weeks. I've never had a period within a week of each other. Could this be a sign of miscarrying! I haven't taken a pregnancy test. Thank you