Avoiding infections is key, so wash your hands often and stay away from crowded places. Honestly, if you even get a mild temperature, never self-medicate and call your gynac immediately. Best to ask them about safe flu shots too.
During my pregnancy, I just made sure to drink warm water and avoided outside street food entirely. My family was very strict about eating fresh home-cooked meals to prevent stomach bugs or flu. I am not an expert though, so do talk to your doctor for professional advice on this.
When I was staying at my mummy's place, she used to make sure I got enough rest and didn't go out in extreme weather. She would make warm soups and fresh kadha with tulsi for me. Having family around to pamper u really helps keep the sickness away.
Meri saas always told me to drink haldi doodh and take proper steam if I felt a cold coming on to prevent any fever. It really helped keep my immunity up throughout the nine months. Still, if temperature rises even a bit, better to consult your doc.
Honestly, at 8 months, my only strategy to avoid fever or any virus is to lock myself in my room and avoid people! But jokes apart, just wash your hands well and tell husband to handle outdoor chores. It's too hot and tiring to deal with a cold right now anyway.
I was absolutely terrified of catching viral fever during my first trimester and kept sanitizing everything. But my doc reassured me that standard precautions like drinking boiled water and eating hot ghar ka khana are enough. You don't have to panic, just keep basic hygiene in mind.
I am also planning my pregnancy and my MIL suggested staying away from people who are sick. Just eating fresh warm food and drinking clean water seems like a good way to stay safe. I hope we both have a healthy journey ahead!