Primolut-Nor is a hormonal treatment that causes uterine bleeding. Therefore, bleeding as a result of this medication will make you niddah, even after menopause.
However, not all spotting invalidates the seven clean days. If you found the spotting on toilet paper, as long as you did not wipe immediately after urinating, it did not invalidate the clean days. If the stains were not a niddah color (e.g., light brown like coffee with milk, see more here), they may be disregarded. If a stain was found on white underwear but was smaller than a gris (the size of an Israeli shekel or American dime), it also may be disregarded. If any of the individual stains were larger than a gris, or if stains of any size were found on a internal bedikah, you should bring them to a halachic authority for evaluation, since not all shades will invalidate the clean days. Please see our page on stains for further details.
If the staining did invalidate your clean days, then you need to perform a new hefsek taharah and then count a new seven clean days. You do not need a new minimum wait. You should take care to wait at least a few seconds between urinating and wiping to avoid questions about toilet paper. You can also change your underwear more frequently to prevent any stains from accumulating to the size of a gris. You should perform only one bedikah per day. If the staining persists, or if bedikot are uncomfortable or irritating, please get back to us to discuss further reducing the number of bedikot and/or wearing disposable pantiliners during the clean days.
Please feel free to get back to us with any further questions.