Haah, totally normal lah! I rasa mcm itu juga masa 3rd trimester, badan tu dah heavy dengan baby, plus hormones berubah, so memang lenguh dan lesu semacam. A few of my mum friends cakap they felt like they're coming down with something but it's just the exhaustion + weight. Make sure you're drinking enough water, getting rest when you can, and eat properly lah, sometimes weakness tu juga sebab kita tak cukup calories. Tapi if it gets worse or you develop fever or anything, better check with your gynae kan, just to be safe!