Is there a chance I could be pregnant?

So lately I haven’t been taking my bc pill on the same time, it’s always really sporadic and I’ve been having unprotected sex as well. I had my period a couple weeks ago, but it was super duper light and mostly brown and barely anything on my pad. These past two days I’ve felt nauseous just randomly. I can’t get a pregnancy test as of right now, but I feel like there could be a chance I’m pregnant. What do you think?

EDIT: I just bought a test and it came out negative