Advice?

Amanda
Here's the deal:
I haven't had my period since Jan 8-12, which puts me at about 2 1/2 months late now. I've had 6 negative HPT's. 
I've had cramping, nausea, dizziness, moodiness, clear/white discharge, and headaches. 
I went to the OBGYN, and they only did a urine test, which of course came back negative and then immediately tried to start me on progesterone pills. (Provera)
I told them I did not feel comfortable taking them and asked that they do a blood test and ultrasound. 
They refused to do an ultrasound unless something comes back in my blood test. 
Now, I've gotten more cramping, nausea and yesterday, just my left breast was sore. 
I'm going for my blood test on Monday. 
But if it comes back negative, should I take the progesterone or do you guys think I'm pregnant? Everyone says I'm just stressed out about this and that's why I haven't gotten my cycle. What do you guys think?