Hate to be the bearer of bad news but yes - to both.

You are more likely to develop ovarian cysts if you have had them in the past.

It is also possible to develop them during or after prg, depending on what type they are.

Mine developed post prg while I was b'feeding and grew to 8.5cm in 6 months.

I would definitely go and get it checked out. I had a friend who ignored the niggling pain (she'd had them before too) and by the time she was rushed to hospital they found an 18cm cyst

Hope it turns out to be nothing