Faint positive ?

So last night I felt a bit warm, took my temp and it was 101.1. I’ve had unbelievable mood swings, breasts are tender, sleeping ALLLL day long, and the worst nausea. I finally decided to take a cheap test this morning. First test was a very noticeable faint line but it disappeared when it completely dried. I was so shocked that I had to take another one except this one was completely negative. Could this be because your first urine of the day is the most accurate? Any help would be appreciated, I just don’t want to get my hopes up:/