3 month ago i had oral sex with my bf our clothes were on,,, after one month i got my period but it waas only for 2 days . same thing happen for next month too ... but now in sept. the date of menses are gone ..late date of menses was 13 august .. but 2day is 18 sept still my menstruation is not come but should i do? its i m pregnant or its something else plss . help me out from diss