Aiyah girl, 15 weeks and still kena morning sickness je, totally normal, a few of us had it dragging till 16-17 weeks jugak! The tiredness is real because your body is working overtime, so just rest when you can and jangan force yourself too much lah. Make sure you're eating small meals throughout the day even if tak feel like it, and stay hydrated because the pening + lethargy gets worse when you're dehydrated. Your body will catch up soon, usually by week 16-17 baru settle sikit, hang in there mama!