Hi Hun
I had something similar yesterday. I took it with FMU and it was a negative. I took another at 10am and there was a very very faint line - the kind you have to look at from different angles and hold up to the light. I wasn't sure I could see any colour.
I tried again at 2pm and had a similar thing and then again at 6pm it got a bit darker. Did another FMU this morning and it was pink.
There might not be enough HCG in your system - some women have better results with 2nd morning urine so if you have more tests, perhaps try again or if you have willpower (I have none), leave it til tomorrow or Thursday and try again.
Good luck
xx