Can't really say, depends on if she had anything time frame. Too many variables to give an estimation.
Is there a high risk of these?
am very worried
Only real risk would be STD's that are transmitted form skin to skin contact...herpes, HPV and syphilis.
Herpes testing-3 months, Syphilis-6 weeks, No HPV test in men
i was laying down on my back while she was "grinding" the base of my penis
You rubbed her gentials with yours?