Late but negative HPT?!

Kayleigh
I stopped taking my BCP 2 months ago, I had a normal period last month that started exactly on time. This month however I am now 5 days late with no warning signs of it starting. I've done 2 HPTs both negative. We had sex a few times this month around ovulation. Is it possible I am pregnant? Or is it likely to just by my cycle regulating?