help!!!!!

Okay so I think I'm pregnant I've been having symptoms like light headed ,nause, pinkish spotting day before I was suppose to get my period . He didn't come in me I'm pretty sure . He used the pull out method all the times . But the only thing Is I went out this weekend and drank and didn't feel sick I just felt tired . I'm also a regular cannabis smoker and I don't get nause smoking or at times I'll smoke it in backwoods which is Tabaco leaf .idk please help I'm just soooo Confuesd