OMG HELP

I checked my cervix this morning, noticed a little bit of dark blood, put a tampon in and a few hours later took it out to only find a little bit of brown blood with a tiny bit of red. Checked my cervix again and there was nothing there...possible implantation? I took a pregnancy test this morning and it came back negative. My cycles are usually 33 days. I was only on cycle day 26...help!! I ovulated 10 or 11 days ago