I’m late and I don’t know if I’m pregnant!

Ok so background info: I’m 17 and have been with my boyfriend for a year and a half. I’m on birth control and we have sex pretty much once a week at least. He does cum in me because we hate condoms. Sometimes he does pullout just so he’s not doing it all the time. My period is supposed to be regular but for the past few months it’s been as late by 18 days. I’ve taken the pregnancy test and it’s negative when it was late those 18 days.

Now: My period is now late by 35 days. I keep thinking that it’s because mine is very abnormal but obviously this is quite a long time. It’s hard for me to get a pregnancy test because I can’t do them at our houses due to our parents. I really don’t feel like I have any signs of pregnancy other than maybe my boobs being sensitive.

Please help!