No signs of infection? No need to worry about that from what you are seeing.
Infections that aren't in STD categories are generally of 2 types: yeast and bacteria.
Yeast is possible in any moist area of the body, and you can do a lot of reading about it if you want. It's from an imbalance in pH. It is common in the vagina and is smelly and looks like cottage cheese.
Bacteria can get into the urinary tract (UTI) for just about any reason, and UTIs are common.
It can also get into tiny cuts in the skin, especially delicate skin around the vulva and vagina, such as from rough sex or masturbating with objects or even fingernail cuts. That's no different from getting through a cut in the skin anywhere in the body.
Try not to worry about old blood, whether dark red, brown, or blackish. Or pink and watery, or clumps of menstrual lining, or the more gluey secretion that is clear when not mixed with blood. All normal and all will vary over the months and years.
As for aches and pains, look into pelvic tilt exercise, heating pads, warm baths, and avoiding heavy foods, caffeine, and getting constipated. Eat a healthy diet, and keep your lower torso and legs WARM in cold weather.
(Ironically, 17 years after menopause, I now have to do pelvic tilts to help my lower back as lower spinal nerves get pinched as I get shorter.)
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