So, 2 weeks ago I got the contraceptive bar out of my arm, I want supposed to go and start the shot on the 2nd day of my next period. 2 days after having the bar removed I got my period (as normal). I don't drive and my parents went away so I am only going to the doctors tomorrow to get the shot but today I have started spotting? My period isn't due for 10 days still. My partner and I did have sex twice in those 2 and a half weeks.. How long does it take to spot if you're pregnant?! Please help!