I'm late

So, according to eve, I am now 47 days late. I've missed two periods; haven't had one since early December.

When I was younger, I used to skip around, but I've been almost like clockwork the last two years.

I've taken 3 home tests and went to a clinic to get a blood test. Everything is negative. I have a lot of the regular symptoms. Trouble sleeping, tender nips, coupled with the lack of blood. But I have cramped on and OCD in the last couple months...

I'm seriously worried now. Not as much as I was before the blood test, but still worried. Any thoughts?