Period and pregnant?

I know this might be a dumb question but here it goes. My period was late last month and it was our first month with no bc. I took a pregnancy test the day after it was due and it was negative and my period came the day after that. My period felt normal except my cramps were pretty bad which is not normal but I assumed it was just because it was so late. My period ended and I am now in my peak week of the next cycle. But the thing is my boobs are still sore from before my last period. Normally they stop being sore half way through my period. And this whole week I have been having tummy issues. Constipation and acid reflux very bad which is definitely not normal. I haven't had acid reflux since I was young. My diet isn't very different. And nothing is really out of the ordinary. I did move back from college in December but my life has been pretty much back to normal since then. Is it possible these issues are just due to hormones from my cycle? Or could I be pregnant even tho I had my period?