does having sex change your period?

melissa

I'm 16 I had sex around three times and my period is different its light and that never happens to me I looked it up and of course google scared me and said I could be pregnant but I doubt that we used protection and made sure we knew how to put on a condom correctly so nothing would go wrong but what i would like to know is if its normal for it to be light, this is the first period I've gotten since the first time I had sex it's not late just light.