Pregnant scare???

So I lost my virginity about a month ago to my boyfriend and we’ve used a condom every time, but I’m super paranoid about being pregnant and like I’m super nauseous lately and food hasn’t been tasting great to me? And I’m having weird discharge that I’ve never had before. I’m 18 and neither of us can afford a baby or ourselves honestly. Help?

EDIT: I don’t want to go on birth control, I don’t want my body’s natural flow to stop or change, I just don’t want to be pregnant.