Hello everybody!! Need your help.

[MelloYello]

I'm 5dpo and have been experiencing light cramping, sore breasts, light headaches. I went to the restroom this morning to pee and wiped only to find a light pink tinge on the toilet paper. This hasn't happened anymore since this morning though. i have had unprotected sex since my period ended on the 17 and i definitely had unprotected sex during OV......as a matter of fact on both of my most fertile days. I've also had mild backaches that require a pillow. Could this have been implantation bleeding.....could my calculations for OV be off? Really want to be a mommy again. i have an 11yr old son, and twin foster daughters that are a year and a half I'm adopting but I also lost a beautiful baby girl 7 months into my pregnancy. i really want this.....BAD. Help!! LOL