implantation? HELP!

Fal
I am trying to conceive and had my last period on 12/5 so I ovulated on 12/19 and had sex 12/14-12/19 and took a test on 12/29 because I was feeling extremely emotional but it was a negative. The next two days I felt weird cramping on and off, lower back pain and very tender boobs- I usually don't get any of these before my period besides some what of tender boobs. My period is suppose to come tomorrow 1/2 (I think). Could this have been implantation? Or would it have had to happened sooner? And if it was implantation than how long do I wait until I take a test? 
My last three month periods were 10/9, 11/5, 12/5