What Causes Brownish Discharge During Menstruation?

I am 43 years old and six months ago I stopped bc and gyn tested my fsh levels at 56. I didn't realize I started the change of life while on bc so I had no idea if I was post menopausal or if I would have a period again. I used fertility tests for a few months which showed I had high fsh levels and ovulation kits were always positive which showed I had a high lh which does go hand in hand with high fsh. However, after 6 months I finally started Sept 10. On day 3, I used an over the counter fertility test and it came back negative, suggesting my fsh levels were in normal range. My period was heavy for five day and then slowly stopped. Then, starting about a week ago I had some light red spotting a couple of days, sometimes only on tp, then kinda stopped and then the last couple of days I've had brown spotting. I am figuring possibly starting sometime this week, 28-30 day cycle, but not sure since this is my first period last month. After my period started Sept 10, all my ovulation tests were negative until about 13 days after my period and stayed positive for two days, then were negative. Should I be concered about this brown spotting or is this indicative of the menopause change? Thanks for your help.