Pregnant or crazy ?!

Well ive missed my period by nine or ten days ive taken first response test and get very super faint lines that you have to us a flash light or sun to see and now im spotting light pink and clear stuff and ive been cramping so could I be in the early stages of pregnancy? I have one child after ready but never had this happen and i found out on my third day of my missed period so im kinda worried !!