I need help asap I'm stressing & worrying

Okay so I had sex with this guy on June 25 & the condom broke so the next day He got me a take action pill I took it excalty 24hours & I got my period of July 8th & I was suppose to get my period on August 12 & I haven't got it. & I took testes & they come out negative, can someone give me some advice please .