Okay.. please read this and don't criticize.

So it was about 4 week's ago I lost my virginity and I was 10 days late and I was scared I was pregnant.. when I got my period it lasted for 3 days (mine usually last for 6 or maybe 7) and was less blood.. I didn't think anything of this. I'm getting cramping in my stomach and I have constipation but when I can go to the bathroom it's diarrhea. I have nausea a lot.. I mean alot. I don't have access to a pregnancy test... is there a chance I could be pregnant? What do you guys think?