My girlfriend hasn't gotten her period yet. We had sex 25 days ago on Oct 4. Her last period was on Sept 17, and the one before on Aug 12. She has a history of highly irregular cycles ranging from 34-44 days to start with . While having sex too, I made sure the the condom never broke, the penis was never even close to the vagina and I came in the condom way outside her vagina- in the washroom. Should I be worried of pregnancy?