What is this!?! (Tmi pic)

So here's the story. I have been taking a birth control pill for about three years now. I will be going on a week long vacation next week when my period was suppose to come so I decided to try and make it come early by skipping the last week of active pills (having already taken two weeks). Today is the day I expected to have my period and this is what I got. I was also taking high doses of vitamin C for the last four days to also try and induce my period. I also had unprotected sex on the pill four days before I stopped taking the pill early. It started out as watery reddish brown liquid and then finally ended up in that blob. What is in that pad is what came out just over the course of the day. Can someone please tell me what this is? Please tell me it's not a sign of pregnancy and is just the weird start to a period!​