Do I have a virus on my iPhone?

I recently went on some websites to save a picture from instagram. There are not any signs that my phone is 'infected' other than just steep drops in battery use graph ( the battery section in settings does not show any abnormal app nor do I have any apps that I do not recognize) and some glitches like for eg. the clock widget being white even after sunset, spotify not playing songs on mobile data etc, which a force restart fixed. A few weeks ago, the battery usage for the 'Last 10 days' reset on its own. A bunch of small things are just getting me worried that there's some kind of virus or malware? After reading a bunch of posts, I just cleared my browser, deleted the saved pictures and force restarted my phone multiple times but the battery drain is still persistent and I noticed there were few pictures in my gallery that were greyed out and said 'unable to load photo', though I have no idea what those photos were. That only happened once around the same time as the battery use resetting itself and after deleting did not happen again.