At the least, once a year.
This can vary between people with certain partners and such. You should test before symptoms appear because usually, once symptoms appear, it is too late to be cured or treated.
Every six months can be frequented and sometimes preferred but is not required. Once a year is the least a person could do to test for STD's.
Hope this helps!
Your pulse can show you so much things! You can try to detect murmurs, or irregular heart beats, or you can see if your heart rate is in a healthy zone.
I believe the answer is Diabetes
I believe it’s A. Birth control patch