STI is a sexually transmitted infection, while STD is a sexually transmitted disease. STI is the most accurate term for these because most infections don't lead to the disorders, while STD is a complex term because the only infection spreads from one person to another, not a disease. STD is the most searched term on the internet and is used in medical schools and hospitals. So STD can not be changed to STI. You can read more about STI VS STD on the trusted source Medical Buck.
You can also get tested for STDs during periods. Periods don't affect the results of STD testing.
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