The size of the adnexal cyst
you have mentioned is very small to worry about and to cause complications. Myometrial cysts and fibroids if small are nothing to worry about. They are found in all females during reproductive period.
But what im worried is that you have missed your period. Since you have had regular cycles, it should be better taken as an alert especially when you have an adnexal cyst associated. It can be that you have an ectopic pregnancy
( pregnancy at a site other than uterus
most commonly in adnexa), so its not wrong if you get yourself workeup to be sure about not having one. I suugest you get your blood tested for beta hcG
. Once your beta hcg is negative , there is nothing to worry. And in that case your cyst would resolve. You just need to follow it up with repeat ultrasound
after a month if it doesnt increase it neednt be managed as its too small. For pain you can use analgesics like ibuprofen
which would also settle inflammation around cyst which might be causing pain.
For now you first get ectopic pregnancy ruled out first and then you neednt worry as your cyst is too small.