Question and it kinda gross lol. I have a yeast infection (thanks pregnancy) I bought monistat 3…

Question and it kinda gross lol. I have a yeast infection (thanks pregnancy) I bought monistat 3 because the pharmacy was out of the 7 day one. I started it yesterday, but should I keep going with the 3 or try to find a 7? Does it matter? I have only ever had 2 yeast infections, this being the 2nd. Is monistat 3 safe while preggers?