Nexplanon removal and TTC nerves

Hi everyone! I had my nexplanon removed on Aug 28th. My fiance and I have had sex regularly since. I have had none of the rebound of a period at all from my nexplanon removal. I’m scared that my body will just never revert to pre birth control and that the TTC journey just isn’t going to work. I don’t even know how to even guess at ovulation time. Is this level of nerves normal?! I also want to ask my OB questions about things I should do to prepare my body better and stuff but I don’t even know what to ask because this is overwhelming.