Think I'm pregnant?

I saw my boyfriend last month for the first time in 9 months when I saw him I was still on my period.I stopped the very next morning.We had sex and didn't use condoms.Ive smoked weed with him and every time I did I'd feel sick and that never happened.Since I came back I've been having stomach pain and had to pee a lot.When I pee it's normal and it doesn't hurt.I was only with him for a week and a half anwhen I left a couple days later I started to feel weird.