thank-you for your replies, you have definitely helped put my mind at ease.
Your unlikely to get pregnant a day before your period anyway and thats not including the fact you wore a condom etc so it is unlikely she is pregnant. If she is worrying shes pregnant that alone can delay her period. Anyway if it is a big concern maybe she should have a back up contraception too like the pill ? Then your doubley safe and dont have to worry again.
If it was her first time (like she was a virgin) or if it has been a long time since she has had sex then that could mess up her periods as well. It always did mine. When I lost my virginity I went 2 months without a period but wasn't pregnant. Then when I got divorced and didn't have sex with anyone for about 6 months the first time I did it made me about a month late.
Yeah if she is pregnant it's not yours.
Stress? If she's really worried about it, that would be enough for sure. It does seem weird but if you wore a condom the whole time and didn't even finish it would be impossible for her to be pregnant. Hopefully she hasn't slept with anyone else or she's not lying to you about anything.
Irregular period or stress. She could also be hoping she is pregnant and if you think so much that oh I'm pregnant it can play games with your head
Thanks for the reply.. Then what could be the explanation for her late period?
I'd say absolutely not unless there's something you're not saying or you don't know how to use a condom.