My vagina has an ammonia, fishy smell after vacation

I went on vacation to the Dominican Republic and was on my period for the first few days. During that time, I used a tampon while swimming. I ended up wearing a wet tampon for most of the day. After my period ended, I wore wet bikinis for hours and also got sand in my vagina. I showered to rinse off the sand and later had sex. I didn’t notice a fishy smell until yesterday. I’m assuming my vagina has been through a lot, and my pH balance might have been affected.

Has this happened to anyone before?