Help please

I just found out today that I’m pregnant. Went to a nearby clinic and they told me I’m 18 WEEKS 😱😱😱 I’m worried because I’ve been smoking weed every single day ... like 4-5 bowls a day.. filled to the damn top. I asked the ultrasound technician about it but all she told me was that I have to wait for my ob appointment.. which is in 3 weeks.. helpee

Edit: literally no symptoms honestly. When I think about I’ve been more tired than usual but I work a lot so I didn’t think anything of it. My birth control shot is supposed to last another year