Mazal tov on your recent wedding!
Given that you already completed an act of relations and already separated for
dam betulim, you are correct that your primary concern now should be minimizing the chances of recurrence. If you were to find more
dam betulim, you would have to separate again. In practice, you are not required to look for
dam betulim now and you should seek halachic advice if any question arises.
Your best bet is to have relations on colored sheets. If you or your husband uses a towel at any stage, use a darkly colored towel. Do not perform a
bedikah after relations. Do not look for signs of bleeding and actively avoid looking for the first minutes after relations. Review the laws of
stains (ketamim) and take the usual precautions against becoming
niddah from staining: wear colored underwear and avoid looking at toilet paper. Please let us know if we can be of further assistance.