Worried over missed period! Should I be?!

Worried over missed period! Should I be?

Hi girls.
My last period was on May the 11th.
My cycles are usually 32-35 days long.
So I missed my period that was due for June.

I am 24 years old. Mother of two.
This has never happened to me before.
I have never had a period any later then 9 days late.
My diet hasn't changed, my weight hasn't went up or down, I haven't started any new excersise routines and don't over excersise, My stress limit hasn't went up or down, Everything has pretty much stayed the same! I just don't understand.

I have had two blood hcg tests at my doctors office, both were negative. I have had 7 home test which all were negative so I know I'm not pregnant. I just don't understand what could have made this happen.

I am worried that it is happening because I have some sort of bad cancerous tumor, or some kind of overy cancer or something very horrible is going on with me. Should I be this worried? The only symptoms I have is lower abdomanal cramps/pain that come and go everyday. Help!!!

Sometimes stress and also hormone imbalances can affect our periods but because of the pain you have been having I would recommend checking with your dr to see what they think and say.