What's going on?

Hello, my boyfriend and I had sex on June 25th. My period was supposed to come around June 18-20th of this month, but it didn't and hasn't come. I went to the doctor for a pregnancy test and it came out negative.

Yesterday, once again I had sex with my boyfriend yesterday. As we were in that business he realized that the condom was missing, then he took out another one and put it on and continued going on. When we finished he took me home since it was getting late and told me he was going to look for it carefully once he returns back to his house. But he didn't. -_-

Today around 11am, I went to the restroom and as I was about to flush it i noticed something and then i saw that it was the condom. 😮

I would like to know, since my period is late and I had sex and the condom came off, could i get pregnant??

My period is irregular, not sure if this helps.