Extreme fatigue

Zh

Anybody suddenly experiencing extreme fatigue?! I thought I was over that now at 21 weeks + 3 days and suddenly started to feel very tired again! I sleep quite well at night but still wake up feeling tired... cannot focus at work and end up dozzing off for good 10 15 minutes at my desk!!! I thought tiredness would only return in the third trimester and was looking forward to enjoy the energised me for the next two months !