For the last couple of months my menstrual cycle has not been normal. Usually I menstruate 4 to 5 days, regular flow. But lately, I will only menstruate 2 to 3 days lightly. And now, it has been almost 2 weeks since I menstruated '' and I am having a brownish discharge. I know that I cannot be pregnant because I had a tubal ligation. I have no idea what could be causing this. I am only 28, too young for menopause... any ideas?

Sounds like a hormone imbalance - see you dr and take a period diary with you. Likely it will all settle down soon.

I gave birth 6 weeks ago I did not breaastfeed because the baby died 4 weeks later I had sex twice, I also had sex once in the 6th week. Then I started menstrating irregular in the 6th week cold this be that I'm pregnant.