No where will do blood work unless signs of miscarriage?

I’ve also had two miscarriages this year (one in March at 17 weeks and one in August at 6 weeks. Had a d&e; with my son and a d&c; in August) just found out I’m pregnant again, my last period was oct 31st and my period was due Nov 27-Dec2 and it never came. I tested and tested up to last Tuesday and got negatives then last Saturday my son made a comment asking if I had a baby in my belly so I decided to test again that night ( 15 days late) and finally got my positive. Went to the store and bought for more the next day, including a digital and yep all positive. I called 2 different obgyn to see about blood work and neither will do it it. The obgyn I want to go to wont see me until 10 weeks and that’s just a nurse visit. Then again at 12 and that’s just a vag check up or whatever. I’m freaking out because I didn’t even make it passed 6 weeks last time but apparently I’m like 7+2. I’m just not sure why’d I be getting negatives if I was that far along? But I’m also a nervous wreck, just feels like I’m playing a waiting game.