Ovulation bleeding

Hi all! Just wanted to ask how common is ovulation bleeding? This is my first time bleeding during ovulation (also had very rough sex 2 says before ovulation bleeding) and last week my period ended and lasted 10 days which was unusual for me and was very light also. Usually i last 5-7 days with very heavy bleeding. Also im in nursing school and have been stressed all year due to no breaks at all and monthly exams. Can ovulation bleeding happen every month for some or just every now and then?