Mazal tov on your wedding!
Hymeneal bleeding with the second act of relations still creates a niddah status, even when the couple previously had complete relations with bleeding and separated. When observing niddah in this type of case, the halachic day on which the bleeding occurred counts as day one, with a hefsek taharah taking place as early as day four.
However, not all staining after relations makes a woman niddah. The color and size of the stain are relevant, as are the surface on which it was found and how long after relations it was found. You are welcome to write us back with details. For a quicker response, we suggest you try our phone hotline. For a complete response, including evaluation of the stain if necessary, you may wish to contact a local rav.
Please note that you are not required to look for bleeding following your next acts of relations. We would suggest not looking, and taking care to use only colored sheets, to avoid any further questionable situations.
It sounds as though any bleeding you have is dwindling, which is normal. Please be back in touch or contact a physician if it increases again or does not completely subside soon.
Please write back with any further questions.