No, not HIV, not this quick. You should protect your health and use condoms. Especially if you are having sex with partners that can be infected. Just make the rule, 'no condom, no sex', and stay safe.
Yeast infections are because your yeast balance inside your vagina gets disturbed. Do not insert anything flavoured inside your vagina, do not douche, do not transfer bacteria from your anus to your vagina, make sure everything going inside your vagina is clean, cut down on sugars in your diet, eat yogurt, make sure you are not prediabetic. Antibiotics can also cause a yeast infection.
The yeast in your vagina craves sugars. So make doubly sure nothing sweet or flavored goes there.