In general orange is a questionable color and stains that are orangey should be brought to a halachic authority for evaluation. If it is a specific shade that you have brought a few times for evaluation and were told it’s acceptable, and you are certain it is the same acceptable shade, you may trust your judgement that it is acceptable. But if you are not sure about these bedikot, they should be evaluated.
If you still have the hefsek from Friday and the bedikah from Shabbat afternoon, you should bring them for evaluation. If they are both acceptable shades you may continue with your original count. If either of them were niddah colors, you will count your clean days from the new hefsek you performed on Shabbat before sunset, and your new day 1 is Sunday.
If you don’t have the stained cloths to bring for evaluation you should count your clean days from the hefsek you performed on Shabbat before sunset and day 1 is on Sunday.
Please feel free to get back to us with any further questions.