Not at all! You can be absolutely relaxed about this because there is zero chance of pregnancy through oral sex. Hope you have a very healthy and happy journey ahead!
If it was that easy, I wouldn't have ended up with twins after months of proper tracking! No, it is scientifically impossible to get pregnant from oral sex. Relax, your anatomy doesn't work that way.
Since you are asking about these things, just make sure to do your regular checkups with your doctor for general reproductive health. When I had thyroid issues, regular doctor visits and tracking really helped clear all my doubts about what is safe and what is not.
This is biologically impossible. If you have any doubts about intimacy or safe practices during this phase, you can openly ask your hospital team or gynac. They usually provide very helpful consultation sessions on this.