Why am I having more frequent periods?

I've lost about 70 lbs over the last 10 months. I had my gallbladder removed last August. Before losing weight, I was on about a 30 - 35 day cycle. The last few months, it's been every 27 - 28 days. Last month, it was 26 days. Today I'm starting at only 21 days! I'm 37 years old and have one 17-year-old daughter. I have never had any surgeries to my reproductive organs, not even my tubes tied. I'm married, but the only thing that's different is that we've been more active lately (since I lost so much weight). Any ideas?Why am I having more frequent periods?
It could be a sign of endometriosis....
visit your doctor....
much luck...and congratulations on the 70lb. weight loss...
cuz ur a female
Please see a doctor.
You Might not wanna ask random people this,
they could tell you wrong answer and you,
can get into something. I would ask a Doctor,
see your doctor straight away
Hormonal changes. Sounds normal to me.
First ask doc! Sec... I went threw the same when I had my hysterocomy at a very young age of 24. Could be that you are going threw the change but once again.. Get to you DOC!!!!!