Risk of pregnacy&&weed usage

Hello Am 18yrs old and yesterday me andy boyfriend had sex we didnt use protection and he didnt pull out either. I knoe theres alot of risk but at the heat of the moment well you knoe how things get.. Anyways my bf smokes ALOT of weed and i smoke some too i heard that when you smoke weed theres less chances of getting prego is It ??? Noo judments plis am here to get some helpful advice/answers (: thanks