How exhausted are we?

I am usually extremely active. I run around 35km per week (and every other week I will do a long run that bumps that up to around 50-60km). I also enjoy hiking and am used to hiking every weekend. I also walk instead of take a car whenever possible, averaging between 15k-25k steps per day (35-40k on my best days). I also have 3 school aged kids and work 5 hour days 5 days per week (and the odd 10 hour day a few times per month). This used to all be easily doable. But now im 8 weeks pregnant and I dont even recognize myself! I took the car today, I can't get off the couch in the evening, and I had my partner pick up dinner because I just didnt have the energy. I do have a history of severe iron deficiency anemia (genetic) but its never made me feel like this before. Everytime I get up I get headrushes and out of breath. I've been able to maintain my 5km and 10km runs but not sure if I can keep this up. Anyone else this exhausted? Should I be very concerned? Tell me it gets better!