Help!!!!!!!!

I am freaking myself out, I am stressed and starting to get drepressed literally. Okay so I took plan b like last month and I took it again this month too. & I just started my BC pill yesterday and I got off my period yesterday as well. But my period was only for 3 days and it was heavy. I am worried because I never have a 3 day period usually a 4 day period. I know plan b and mess up your periods for awhile but idk. Then today I went to the bathroom and I was a little blood just light am I spotting for the BC or is it because I am pregnant? I mean I don't think I am pregnant because I would be craving stuff and I'm not I haven't even eaten in 2 days because I am so stressed out thinking about this. I am also bloated as well just alittle. I just feel fat.  Should I take a pregnancy test or no? Also my period did come a week earlier maybe because of the Plan b idk. I just want to cry at this point