cyst on ovary?

at my first appointment (prenatal) back in the end of october after the ultrasound , we were waiting on the doctor to come back and i look at the paper next to me and it says something about a cyst on ovary . and she never mentioned anything about it . so i let it go . & last week (20 weeks & anatomy scan) (new doctor) they did the scan and she said “oh you have a little cyst on your ovary there” and no one seemed worried or concerned. she didn’t mention anything else about it . but i’ve been very worried about it , bc my sister has had to have surgery bc of a cyst & me being currently pregnant, im just wondering will they cyst affect my labor and delivery? should i be so worried about it? will it go away on its own? is this normal during pregnancy?