Question

Hello Rabbi,
I wanted to ask: my wife had a miscarriage at the beginning of pregnancy two and a half weeks ago. We were told that we need to wait two weeks out of doubt that perhaps it was a female fetus, and after that another seven clean days. We waited two weeks even though the bleeding had already stopped eight days after the miscarriage. From checking the Shulchan Arukh, it became clear to me that one may begin counting the seven clean days already during those two weeks. The problem is that my wife did not do a purity examination when the bleeding stopped, but only at the end of the two weeks. My question is whether one may rely on the fact that she saw that the bleeding had stopped after eight days even though there was no purity examination, or whether there is no such possibility.
B. What is the significance of brown stains? And what is their significance when they tend toward reddishness? And if that is forbidden, what is the law when most of the stain is brown and does not tend toward red, and only in a small part of less than the size of a gris it tends toward red?
P.S. I would be happy to receive an answer from the Rabbi and not a referral, because I have already seen what is written and I want to hear the Rabbi's personal opinion. Thank you very much in advance, and have a good week.