Pregnant ?????

So my bf and I had unprotected sex twice now(no condom but im on birth control) and I have had spotting these past few days but because im new on the pill (about three months now) my period is very irregular(they said it will take 4-5 months to stabilize) and im also very tired and not really hungry these past few days... could I be pregnant ?? Also I felt really really sore after the second time we did it ...