Anyone else?

I have been ttc for over a year. I was like clock work with my period. Until about 6 months ago. I go weeks at a time without a period. I visited my OB-GYN and she gave me some medicine that made me have a period. Here I am 7 weeks since my last period and still nothing. All pregnant test are negative.

I've been trying not to think about it too much but it's impossible when you are ttc! Should I visit my OB-GYN again? Has anyone else gone through this?