My period usually comes every month for 5 days. I wasnt having sex until a month ago. I had gone about a year and a month. The first time I did it was on August 7th. My period came 2 days later and it was my normal period. I had sex then on the 24th and 25th of August, then i started bleeding on the 29th which lasted 3 days. I had sex on the 11th if September and im now starting to bleed again today on the 14th. I dont know if it has to do with having sex or if i need to go in. I just want a little insight on what i should do.