Early last month I was due to get the depo shot for the second time, but I didn't get it. About a week and a half ago my bf and I had sex and right after I lightly bled. It was just a light pinkish color, and it's been happening randomly since; only it's not been every day. It's so light that I only wear a panty liner in case it does happen. I've felt light cramping for the last three to four days. I've read a lot online and what I've been feeling sounds a lot like implantation spotting, but I've still gotten two negative pregnancy tests. I have a young daughter, so I'm tired as is; and I breast feed so having any breast pains from pregnancy wouldn't exactly stand out to me. If anybody can help me, it would be greatly appreciated!