This is something your doctor will need to answer. Hope it all works out for you.
I am in a similar situation. I just miscarried at 10 weeks. During my first ultrasound at 6 weeks, they found a 6cm dermoid cyst on my right ovary. Prior to my pregnancy I had irregular periods and weight gain but they never checked me for cysts. Since my pregnancy failed they want to take my dermoid out through laproscopy before I ttc again. I have been doing a lot of reading and I think the existence of the dermoid caused my irregular cycles, which caused late ovulation, and late implantation, which studies show leads to miscarriage.
I would talk to you doctor but seek to get the dermoid out before your next pregnancy.