Possibly ovulating?? Thoughts?

So I’m a little confused, I just stopped my birth control ( the patch) I finished my pack had my period on schedule, started my new pack and took the first patch off 36 hours after wearing it because we decided to TTC. Yesterday I did two clear blue OPK and they were a blank circle so negative. Today I just did one and it’s a flashing smiley. Is it really possible to ovulate this quickly after stopping the patch? I’ve been on the patch for two years