Hello there   I know this must be very worrisome to you and you have given this much thought and analysis.  All I can say is...anything is possible.  This web site on ovulation has this to say about ovulation spotting:    "The trace amount of blood that may appear due to the rupture of the follicle will not be red (like menstrual blood), but will rather exhibit a brownish or pinkish color. For example, you may see just a faint streak of pinkish blood intermingled with cervical fluids during your daily CM check."   But then again...implantation bleeding can be similar.  But the implantation bleeding would occur later and you say that you had the other signs of ovulation.   Nobody can tell you if you are pregnant or not over the Internet.  If I would place a bet I would say no but...I am neither a doctor or psychic.  You may just have to be patient and wait to see if your period comes.   If you are worried you can always contact your gynecologist to see what they say.   Good luck!  If you can let us know what happens.