Chemical or not? Confused

I got a positive wensday, and started to bleed. I was 2 days late this point. Thursday went to the ob and they did a pee test. Neg. I also took a preg test at home after apt. Also neg. I took an ovulation test to track it. It was almost positive. I thought how odd. Then for the heck of it took a preg test positive this was Saturday. More so then my original. Now the ob wants me to test tomorrow and go in for a blood draw Monday. Which was the plan for Thursday but sense the pee test was neg they didn't bother. Anyone else go though this?