Pill user, condom split - Would appreciate some advice to put my mind at rest.?

Hi, I'm 17 and have been sleeping with my boyfriend for a few months. No chance of STIs as we were both virgins. I have been on the combined Pill (Ovranette) since March 21st, no notable side-effects, and I have taken it every day - only ever been late with it buy two hours once, one hour once, and half an hour once. Always use condoms as well to be extra safe, but on Tuesday of this week I had with my boyfriend and after he had finished and pulled out, we realised the condom had split. That day I STUPIDLY took my pill an hour late, (it was that one time) and the next day was the half hour late time. Could I be pregnant? I know it's unlikely but I would appreciate some advice. Sorry if this is a bit long. Also, I can't tell my parents as they don't want me to be ually active. My older sister who is 24 knows about me sleeping with my boyfriend though.