Taking Cerazette. Had Unprotected Sex, Scanty Period, Nausea. Could I Be Pregnant?

I have been taking cerazette for a while now, i am in a long distance relationship with my boyfriend and i had unprotected sex with him twice then 5 days later i had a light bleed lasting for 2 days it was like a scanty period as there was some thick blood but spotting at the beginning and end.therefore i am unsure whether this may be confused with implantation bleeding or just a side effect to the pill (cerazette) i have never missed a pill and take it usually on time maybe an hour or so late but i am never drastically over time in taking it , i know it has a 12 hour window but could an hour or so affected it so much that i may have gotten pregnant i am also experiencing slight nausea and a rise in temperature and should expect my period in a week