Implantation dip???

I know my chart is not giving a lot to go off of but that's only because I just started temping yesterday and my temp would not go above 98.6. I tested many times in a row. But today my temp shot up above 99.0. I tested it a few times until It was at a stable number and it stayed at 99.6. Could this be off or could it be an implantation dip. Plus it feels like the right side of my uterus/pelvis is almost rock hard. I'm 9dpo today and I didn't chart bc I wanted to keep my first time ttc at a minimum to prevent stress but my tww is not allowing me to do that lol