 [ Symptoms ] i had unprotected sex the day i was supposed to start my period now i am 4 days late could i be pregnant  my husband and i had unprotected sex and during it i started what we thought was my period and respectively so it was on time so he ejaculated inside of me once in the light we realized it was just a brownish discharge not exactly my period and that was it i did not discharge again and i also never started my period now i am 4 ish days late could i be pregnant [ Disease ] yes any time that you have unprotected sex there is a possibility of a pregnancy of course there are only a few days per month that ovulation occurs and contraception is most likely just before your period is not one of them but just in case you should do a few pregnancy tests in a few weeks if you have not had a normal period being only four days late is much too soon to worry about it