spotting while on the pills. could i be pregant?

I'm scared, im on the "pill" and this is only my second month of taking the pills. and so far i started my period a week early, it stoped for about a day. and then me and my boyfriend had unprotected sex. and i started a again a few days after my period ended.. i bleed for 2 days, and i stoped and now in like less than a week im bleeding again... this is my 3rd time bleeding! is this normal? or could i possibly be pregnant? i did skip a few days of taking the pill... and im normally late taking my pill at night i normaaly take it at 9 but the last few days iv been taking them 30 or 40 mintues late... and my stomach is hard as rock. and my boobs are so much bigger could this be side affects from the pills? or could i be pregant?