Bleeding during sex and after period has finished!?

For quite a while I have been having bleeding/spotting like a week or so after my period. I naturally assumed this was just a part of my cycle and that it may link to ovulation. But then I was having sex with my boyfriend last night and I bled everywhere! Just wondering if this is normal? Ive read things online and I'm really worried. Just wondering if it may be due to stress or whether it may be more serious than that...??