There is no risk from this.
Here are some posts from our experts (when we had them) that may help -
https://
www.medhelp.org/posts/STDs/Nervous-about-mutual-masturbation/show/2183476
https://
www.medhelp.org/posts/STDs/Mutual-Masturbation-STD/show/1968429
https://
www.medhelp.org/posts/STDs/mutual-masturbation-sti/show/1858544
https://
www.medhelp.org/posts/STDs/Understanding-the-risks-of-mutual-fingering/show/1516796
https://
www.medhelp.org/posts/HIV---Prevention/Vaginal-fluid-on-hand-touched-inside-of-condom-and-head-of-penis/show/1119533 - read this thread thoroughly. There is an excellent explanation about why certain activities are not risks, and why others are.
I expect all your tests to be negative based on what you describe. Make sure you are drinking plenty of water, lay off the alcohol and caffeine if you drink a lot of either or both, and if your symptoms linger, follow up with your doctor.
Mutual masturbation is an abnormal way to get any STD. The only realistic case would be touching a chancre and getting syphilis. You said you were fingering that lady, and then you touched your penis. If her vaginal fluid got inside your urethra there was a theoretical risk of gonorrhea, chlamydia and herpes, but risks are negligible.
You can test as follows:
-3 weeks after the exposure, for gonorrhea and chlamydia.
-6 weeks after the exposure, for syphilis.
-3 months after the exposure, for herpes.
All the best.