Missed Period
I am a 24yr old woman weighing about 130lbs and I am 5'6". I am fairly active and keep a pretty consistent exercise regimen. My husband and I decided to start trying to have kids last month and I am late starting my period this month however I have taken two tests and they were both negative. I have always been very regular before this and I am so far five days late. I have never been diagnosed with anything. I am wondering what could be causing this.