So I've been searching the Internet to try and see if this could be possible. My husband and I had sex on the 17th dec and then on the 21st I had a super light what I though was the start of my period that lasted not even a day. This is really odd for me my period normally lasts 4-7 days and the first two days is quite heavy. Could this possibly be implantation bleeding? Had any one experienced this? I had nothing like this with my first 2. I had maybe spotting with my firstborn that was it. Of course I couldn't help myself had too a pregnancy test and it was BFN I know it's too early to tell if it was.