My period asking crazy

my period is a 7 day period ,
in oct I had sex on my period
nov I got a 4 day period and it was a few days early
dec I didn't get a period at all
what should I do
help help help

hmm well I'd say dont worry but considering you had sex you could be pregnant since you missed a period, because it takes a while for your body to register that your pregnant hense why you had a period in november. umm but it could be nothing my periods were normal but now I get them every 3 weeks instead of 4 and they last a week and they are always clotty turns out because I have hormone inbalance-maybe sex did that to u , go to your doctors

You probably just got a abnormal period. Id take a test just to be sure...If it still doesnt come id see a doctor and maybe get some blood work done to be sure nothing is wrong.