Mazal tov on your recent marriage!
When a woman has intercourse for the first time, she takes on the status of a
niddah whether she bleeds or not, as long as there was full penetration.
The decree of
dam betulim was instituted because there is a chance that there was a drop of
niddah blood that went undetected, covered up by the semen. The nature of halacha is that even if on a specific occasion a Rabbinic enactment does not seem to be relevant, we cannot abrogate it, and therefore even a woman who performs a clean
bedikah immediately after first intercourse is
not exempt. So too a woman who is not expecting any uterine bleeding.
Separating after the first time is indeed challenging. Hopefully the joy and emotional intimacy of your new shared life together will help ease this pause in the development of your physical connection.
For time-sensitive questions we recommend you reach out to our
telephone hotline.