Wa'alaikum assalam! Aah, memang ramai moms experience ni during pregnancy, immune system kita jadi lemah sikit masa pregnant, so viral infections macam batuk and selsema dapat je on and off. A few of my mum friends had the same thing throughout their pregnancy, especially during flu season, it's quite frustrating! Since you're already 30 weeks, I'd suggest check with your doctor or gynae just to make sure everything is okay, especially if the cough is persistent or affecting your sleep and energy, derang boleh advise on what's safe to take. In the meantime, stay hydrated, rest when you can, and avoid being around people who are sick if possible. Take care of yourself ya!