My last period was on 30 July and it finished on 2nd of July, I had unprotected sex on 11 July but he didn’t came inside me.

My supposed period should be on 23 August but I’m 7 days late, I’ve been having backache but nothing else, everything is normal.

I did 2 pregnancy tests, one of them was on 25 August and the other one was 28 August and they both were negative.

What do you think is going on? My period is regular and always in time. I’m freaking out I can’t be pregnant 😭