Could this be implantation bleeding?

Gabriela

I got my period 7/3 and ended 7/11. I had sex on the 15 or 16th and ovulated on 7/17. I still have 7 days left to get my period. I do have lots of pain on my lower left pelvic/hip area & on the right side as well. Tested two days ago and it was Negative (may be too early) HELP!!