Scared I have ovarian cancer.

Hi so after having sex with my partner there was abit of a pain during deep penetration and then for a week or so it really hurt and had a sharp pain when bending and stuff then it went away. Then a month or so later it come back but it was a dull ache nothing else, not painful just annoying. But went away again, now it's back again, still a dull ache and happened after sex, pains gotten fuller then the other 2 times and no sharp pain. 
I am 20 years old.