Very emotional...8 days late

The last few months every time I think I'm pregnant I always get a bfn. I took 2 tests already, the last one I tested 10 days ago, but I haven't  seen my period in 8 days. I made a doctor appointment on Tuesday and I just can't take the thought of another disappointment. I've pretty much given up. I keep reminding myself to not think about it so I don't get stressed out. I've been really good about it up until now.