17 weeks pregnant with twins. I’ve only gained 8 pounds or around 3-4 kilos

Sarah

Feeling a bit worried that I’ve only gained 3-4 kilos which is around 8-9 pounds and I’m 17 weeks pregnant with twins. I’m not really showing either, but I’m 5ft 9 inches, 175cm, so I know this could possibly be the reason why. Just worried that the babies aren’t growing correctly or at the correct weight.. I am eating healthy and sufficient calories. I live an active life, but not over exercising. Maybe I need to rest more to help them grow..?