Pregnancy

I’m in a 6 month relationship with my boyfriend who is in the year below me at high school, I left our school last Friday so I’m only 16. We lost our virginity to each other last November and do it every now nd then, but I’m 7 days late on my period and can’t help but think the worse. I’m not sure wht to do whether I’m overthinking or I should wait another week. I would tell my mum but she didn’t want us doing anything and is so against teen pregnancy so I don’t know what to do.