What is this

I stopped my first packet of the pill 2 weeks because it was giving me bad acne but I starting a new pill next month when I have my period but I had sex last night with a condom but this morning I had blood looks like period blood is this my body just knowing i have stopped the pill or a breakthrough bleed??? I usually get my period this time of the month anways but I already had one from the week off the pill 2 weeks ago