Pregnant again..maybe?

So I stopped taking birth control pills last month. We're trying for another baby now that our June baby is 1. I'm 2 days late and still no sign of my period BUT I have taken 4 pregnancy tests a blue dye, pink dye, and digital and they are all negative.

So I guess my question is, could my cycle be off because of just coming off of the pill or could I be pregnant and it just not showing on the test yet?