Does The Cyst In The Ovary Cause Bleeding In The Mid Of The Menstruation Cycle?

I had sex ( we used condom) with my boyfrnd on 15th ie my last day of menstrual cycle. 10 days later i had bleeding and i got it checked .i got my pelvic ultrasound . It says 5.2 *4.5mm cyst in right ovary. I am jst worried as i have regular period and somethng like this has never happened. I am not taking any pills. Can i be pregnant or is it jst bleeding due to cyst?