Help!!

Okay so i was on the birth control depo for 3 years and i got my last shot in October of 2017 and i didn’t go in January for my last shot so it’s been 7 months now without being on the shot and my period came on for the first time in months last month on the 7th and it was on for 3-4 days and went off and it wasn’t heavy. Also i had unprotected sex during my ovulation period and now my period hasn’t come on yet it was supposed to come on on the 7th or 8th of this month and it still hasn’t come and i took 2 pregnancy test and they both came back negative CAN SOMEBODY TELL ME WHAT SHOULD I DO???? Please