Welcome to the community, samfa. I am sorry you lost your ovary but glad your recovery went well.
The remaining ovary does usually take over for the one that was removed. However, I don't know that there is any set time frame for this to occur. While your body is figuring this out, your cycles may be irregular due to hormonal changes. I hope all returns to normal soon!
Also, I really wish I had known about this site before my surgery!