Hello, I am in a very big crisis,

I had my period on the 12th of january to the 16th of january, but I had sex on the 18th of january(unprotected) the 19th I took a day after pill.

two weeks after taking the pill I had breast tenderness. and it only lasted for a week.

In the month of february I missed my period, and I took a two PTs and they both came out negative.

however I had sex two weeks ago and my period still hasnt come, and I had spotting on my underwear today, What do you think is wrong.

(I have be exercising alot too, these days)