21 years old... 19 days late for my period

According to glow I am 19 days late.. I had sex July 4, 11, 18, 21. My long time boyfriend and I used protection on the 4th, 18th, and 21st. On the 11th, he didn’t pull out in time and ejaculated inside me. I took a plan B on the 14th. After sex on the 18, I noticed dark discharge and didn’t think much of it because it had happened before.

I’ve had the dark discharge since then. I had a urine test on 7/26 at the doctor, negative.

Two hpt on 7/29, negative.

It is now 8/12. Last day for ovulation was 7/12 last month.