could i be pregnant?

me and my boyfriend have been trying to get pregnant for months now. every time, it seems that we have gotten a little closer but then i will start my period. i had surgery back in september, and since then, my period hasn’t been normal. some times it will be early, some times it will be late. it’s hard to track it now, although it used to be a perfect 28 day cycle. anyways, we have been trying to conceive again this month and for the last week i have been having some symptoms like, nausea, my boobs are sore and are swollen, i’m so tired and i have been craving random things. i’m not supposed to start my period for around two more weeks. but my pms symptoms aren’t usually this severe. should i take a pregnancy test? or should i just wait and see if i start my period?