Spotting

Hi, i need to ask, what about if got spotting like not really blood,but it's look like blood.. Just 1 time come out early afternoon today.. I'm very worried, I don't know should i see a doctor or no? ? Actually I'm not really sure if I'm pregnant or no, but my period late 9 days.. I make upt check early morning today i got double line.. Last Sunday i go to clinic, doc scan didn't see anything, and check upt 2 line come out just 1 more line not very clear.. She ask me to wait another 2 weeks means next sunday i go and check again.. But today got spotting like that make me so worried ?