Contraception injection

I started taking the injection on the 14th of December and I got my period the 15th. I am sexually active and me and my partner don’t use condoms. However, last Saturday, we decided to use a condom so he didn’t have to pull out. After we finished, we noticed there was a big hole in the condom but didn’t worry. But now my period is late 8 days which is very unusual for my cycle. Just wanted to know would this be from the injection or could I possible be pregnant? Thanks in advance😬