Period

My last time having sex was June 26, 2017 and I was suppose to be fertile . The next month ( July ) I didn’t get a period at all . Took 3 pregnancy . All came back negative . The month after that ( August ) a light period came . Month after that ( September ) no period at all again .. and now as of today ( October 11th ) no period as well of yet .. my period been regular ever since I had got it when I was younger 🙄😩 . Never been on birth control .. my mother think I’m pregnant . I honestly don’t think so 🤔 . Going to the doctor next week when I get off vacation . What do y’all think ?