I posted a couple days ago about my period being late, and I took plan b last month

Last night my bf and I were about to have sex and I got this burning sharp pain in my lower left abdomen, and was thinking it could be an ovarian cyst

The pain lasted about 30 minutes and then suddenly just disappeared

We tried to have sex but it felt like a painful pressure and we had to stop.

This morning I felt fine and then a couple hours later I started to feel slightly nauseous and have some weird cramps. My boobs are sore and my whole body aches. The cramps come and go but they’re not like normal cramps, idk how to describe it.

Should I go to a doctor? Take a pregnancy test? Wait a couple days and see if it goes away/if my period starts?

What would you do or recommend I do?

Thanks