Wa `alaykum as-salamu wa rahmatullahi wa barakatuh.

 

Two signs declare the end of menses; either the white discharge or the total dry status in which no blood would come out after. If you thought you were not clean yet and missed prayer but verified you were clean you must make up what you missed. If you did not verify you were clean but was in a doubtful status, you are considered still not clean and no need to redo the prayers until you are sure 100%.

 

If brownish spots are connected to the regular period, then it is a normal period. If it was disconnected in time and fell over the regular days, then it is not.

 

Almighty Allah knows best.