Pregnant or not need help

Laura
Ok so I went to the doctor on the 4th which was last Tuesday bc I was not having a period. I had been spotting and then the last period in July was little bit of blood and a little bit of mucus looking. So I talked to doctor. They want to do blood work and an ultrasound. So I went down and had the blood work done. Wednesday I got a call saying I was pregnant. Then had a call on Wednesday that said they do blood work after 48 hour after positive test to make sure that the number was getting bigger. So I said ok will come in again and do more. Did it on Thursday and got call on Monday say it was know coming out negative. What know am I or not? Has anyone had this before? They want me to come in on Wednesday of this next week to do more blood work. Help in need of advice.