I am nursing my 9 month old, all night, and periodically during they day, he also eats almost everything.I am 36 and this is my 5th child. With all my past babies, I never started my period again post birth until about 18 months. I had been experiencing very strong lower back aching for about 3 days,thought I may have been trying to get my period.Had sex with my husband, shortly after when I used the restroom when I wiped there was blood, and again the following day just a tad when I wiped.It is now totally gone, was not a period. I dont know if I have ovulated because I have not had a period since birth...Could this be implantation blood? And if so, how long do I need to wait to take a hpt ? I realize after 5 kids I should know this, but this is new to me...Thank you!