Negative blood work negative


Hey guys I have a question I haven’t had a period my last period was feb 13 & I went and got blood took yesterday my doctor called me back today and said the blood test was negative so I was wondering can I just be to early for her to tell because I went to the doctor last week and they were explaining that on my pee test the line showed up but went away and it was doing that for about 5days so the required blood work and it came back negative