Can someone help?

Ye
What are the chances of stomach flu delaying period? I know that it can delay ovulation which can then delay period if i ovulate late. But i ovulated already and was 7 or 8dpo when i got sick. I'm not sick anymore and today i was expecting af and it didnt come. Now i am ttc and im not asking if i could be pregnant. I know i can be. 
I always wait for a missed period to take a pregnancy test (i dont buy preg test in bulk or keep any in hand on purpose) ill go crazy testing everyday if i had pregnancy test in abundance haha. I'm trying to hold off from taking a test cause if my period can be delayed because of a stupid stomach bug. Dont want to disappoint myself and waste money on a pregnancy test.
So could the stomach bug mess with my cycle? 😳