I'm currently on cd16 and have just finished my fertile window. We dd a day before and during. The last time I had a little brown spotting and today I woke up and had bright red watery blood (tmi!) and then it tapered off to brown later on. I know I have just finished ovulating because I used an opk. Could this be implantation bleeding? If not, and it's from ovulation, can I still get pg?