Paranoid af

So, last month I took plan b and I had my period on time a week later. My period is about 2 days late now and I'm really paranoid even if I did have my period. I keep feeling cramping like it wants to start but it hasn't yet ://///

Also I can't take a test for the next few days because I'm away at a supervised camp :")))

Any advice though? Has plan b ever really messed up your cycle?