Am I pregnant?!!! help!!

So i started my period last thursday, but Ended up starting my new birth control on saturday. because thats when my regular flow started. And according to a Pill tracker I have on my phone, ive taken the pill every day since saturday, so thats 9 days straight I took the pill. And I know the its accurate because the app will annoy me and send notifications until I log that the pill was taken. So I know ive taken the pill 9 days in a row, and for the birth control to be effective you need to take it for atleast 7 days so I should be in clear right?? I had sex yesterday with my husband and he really wanted to come inside me so I let him cuz I knew i took the pill everyday. Everything was fine until today, i just went to go pee and there a was some mucus like looking blood that came out when I wiped. And it wasnt brown either so it wasnt like it was old blood, it was very dark tho so It also wasnt very fresh blood. So now im nervous? Should i just take a plan B?? Does the blood mean anything or is just left over from my period???