birth control or pregnant?

could i be pregnant if i’ve been on birth control on 2 months (march 11th when i started) i didn’t have sex but he rubbed his penis against my vagina for a few minutes (this was on april 10th) and then came on my stomach way after all that happened. im scared of precum but i don’t know if he precam thing bc that was the first thing we did. i’m having back pains and my period was lighter and shorter than usual. my stomach hurts and i’m super stressed and anxious because i have really bad anxiety. my lower abdomen is hurting too. i spotted tuesday and bleed about medium wednesday-friday. saturday i spotted brown a little. all this happened during my sugar pill week when my period was supposed to happen. i’m scared that i could be pregnant bc of the symptoms i’m having. it might be on in my head but i don’t know. please help.....