Best to consult a GP for pregnancy safe medication. Remember to rest more, drink more water and take vitamin C too. Having flu will not harm the baby. I had flu every month during my pregnancy and delivered my baby at week 39.
flu vaccine supposed to lower the severity of the illness if you really do have flu. Probably you are down with different infection and not flu. Hope you have already seen a dr instead of self-medicating
do see the doctor 🙏💕