could I b pregnant o it's just a uti

so last month my periods delayed for about a week... and on the day I'd planned to take my fourth test.. I got my periods and then days before my periods I'd been told by my doctor that I've a yeast infection and I'd finished the treatment... so I was supposed to have got my periods on the 15thof last month but I got them on 21 but now I feel really crappy... I don't like certain foods... I pee all the time but am not nauseous.. could t b the infection Cz I feel like I can't b thinking am pregnant Cz the days don't add up I can't b pregnant 2weeks later