Hello, so a few weeks ago my boyfriend and I were being a bit sexual, and we both had our underwear it got a bit intense, and he ejaculated on my vagina. Around this time I am suppose to start my period and I did today, but it is not as heavy as it usually is. From what i've heard, sperm cannot travel through clothes but I am a bit worried. Any answers would be appreciated. I have also been on vacation for a few weeks and I have heard that it can effect periods as well.