Mazal tov on your recent marriage!
We recommend that you ask other women in the community (or the mikvah attendant) what they do about questionable stains. Is there another Jewish community nearby that has a rabbi whom you can contact? Is there a Chabad nearby? If you are unable to find a rabbi who evaluates stains, you can get back to us with your location and we can try to assist you.
Please note that not all women have regular questionable bedikot. Many women experience menstrual bleeding, and after 5-6 days it completely stops, with no further staining. Additionally, stains that are yellow or light brown (the color of coffee with milk) that have no reddish hue are acceptable and need not be brought for evaluation.
Please feel free to get back to us with any further questions.
B'Hatzlacha!