I had unprotected sex on Thursday the 11th and then again on Friday the 12th I bought the morning after pill the next day so within 48 hour of the first one. The exact same day I saw dark blood almost black it wasn't flowing like period more like heavy discharge. I also experienced some cramps. Today when I checked I still have the dark blood however its more of a lighter discharge twice as less. I'm worried as to whether this is implantation or side effects of the pill. I've taken the pill before and this has never happened to me also I had my period a week before the unprotected sex so my period now isn't due to till another 2 -3 weeks. Please answer