I didn't have much energy at all in my first 12 weeks. The only thing you can do is ride it out. If your body is saying you're tired, then rest or sleep. Your baby is taking a log of energy from you. At around 3pm every day I needed to sleep, even when at work. I was so tired that when I got home I went to bed and slept for 2-3hours. You will get your energy back it will just take time. Go with what your body is telling you. You will feel better