Intense fatigue

Hi! 
This is my first pregnancy -8 weeks 4 days-and I have read that fatigue is a symptom but I am fatigued to the point that I lie in bed/sofa all day (except for a 45 minute walk in the park daily). I'm also colder than I have ever been (thyroid is fine btw). Is this normal level of fatigue?  I almost fell asleep at the wheel the other day. I get 7 hours every night (plus some naps as of late). I have a healthy balanced diet and drink lots of water and take my vitamins and folic acid. I used to exercise 3 to 5 times per week. Now I can hardly handle once per week. 
Lucky for me, I run my own business so can work from home. I manage a collective 2 hours per day.  If I was employed, I don't know how I would hack it! Any insight would be useful.