condom broke during anal

Hi everyone,

My boyfriend and I decided to try anal sex for the second time last night, he wore a condom and I am on the pill ( yes i take it correctly and have never missed a pill). Just as he was putting his penis into my anus, the condom snapped so he took it out straight away and put a new one on. He wasn't wet and had not ejaculated.

I decided to take the morning after pill to make sure I wouldn't get pregnant, even though I am already on the pill.
Do you think I am safe from getting pregnant even thought the condom snapped?

Answers would be greatly appreciated thanks! :-)