Ok so im a teenager and ive asked my mom to buy me birth control pills but she always says no I AM going to have sex this weekend what to do?

Ask for gyno appointment, say you have a weird rash or something. Plan it the day after or right before. Use condemns and have him pull out before. At the gyno don't let your mom in tell her your situation they'll probably give it to you. Or have a friend drive you to planned parenthood. They give things free and no questions asked.

You can put yourself on birth control. Go to a planned parenthood. Not sure if you have to pay, or if there's a way you can use insurance.

If you're 18, you can definitely do this very easily.

Be mature and sort yourself out.
If you are old enough to have sex, you are old enough to organise your own contraception.

Use condoms? Do sex acts with zero risk of pregnancy like oral? Act like an adult engaging in adult behavior and choose to balance risk with reward?

I mean, seriously, even if you went on the pill TODAY you wouldn't be protected by the weekend.

There are people in hell for disobeying their parents. God is older and wiser than all of us and Sex before marriage is a NO

remember Hell is FOREVER and the gate to destruction is wide!

You need to see a gynecologist for that.....better use protection this weekend, and then make an appointment.