It is completely normal to have O pain before, during, and after you O. If you google it, you will find a better explanation than I can give but his is an explanation I found oh JM...
When a woman ovulates, the egg bursts through a follicle inside her ovary and is moved through the fallopian tube towards the uterus.* During ovulation, the fallopian tube contracts rhythmically.* These contractions help to push the egg through the fallopian tube and towards the uterus.* The pain you feel during ovulation is most likely a result of the egg bursting through the follicle.* Following that, you may notice some mild cramping as the fallopian tube contracts and moves the egg through the fallopian tube.* You may notice a pinching pain first – probably from the follicle bursting – and then dull cramping.* Some women only notice the cramping feeling and others feel both types of ovulation pain.* It can last for a few hours or a few days.
I also get these pains every month; some months are worst than others.