Thats good that you checked with your Dr and he's right. Its is most likely due to starting Atkins. Alot of people get break through bleeding when starting off on the WOE... I did too. The first couple of months might be a bit off but then you should go back to normal.

I never had a regular TOM till I started L/Cing. Now it comes right on time every month Its one of the best benefits I have found on this WOL.

Akiwican