Spotting from last 15 days!!! Help

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Hi everyone - I want to know have you felt with irregular periods after starting exercise and dieting. I’m obese with 230 Lbs and haven’t exercised for over a year. I recently started exercise which includes Zumba and some weights. This time when I got my periods it came a little early starting with spotting and continued with spotting ( didn’t get heavy flow or regular flow) and now been 15 days haven’t stopped spotting. I’m 43 YO and a mom of 8 yo girl. Have you experienced anything like that, I have taken appointment with my obgyn but thought to check here too.