Birth Control and TTC

Stephanie • Had first baby July 2017 and second April 2019 🇨🇦
I stopped my birth control the end of August (NuvaRing). We are now TTC but I know it can 100% take time for my body to get into the right cycle. But, in the last 30 or so days I feel like I'm gaining so much weight (4lbs in a month is a lot). I know when starting birth control you are known to gain but have never heard of it when coming off. Please note I've been on birth control since I was 18 years old and now I'm 28.
Thanks in advance !