What you've described sounds pretty normal to me. Weeks 7-11 I pretty much:
- got up at 5am (dragging myself out of bed was one of the hardest parts of the day!)
- dressed to disguise a growing belly
- 2hr drive into work
- start work 8am
- Used every ounce of my strength to a) stay awake b) not throw up c) do enough work to not raise suspicion.
- left work 6pm
- 90min drive home
- walked in the front door and crawled straight into bed.
Repeat.
At weekends I cancelled most plans and spent my time trying to decide what to eat, making it and then throwing it away as Id gone off the idea (!) and sleeping.
I felt like death warmed up! How no one at work noticed, I've no idea, but people aren't as observant you might think.
I'm still waiting for my 2nd trimester glow and energy surge (!) but thinking back, although I still feel constantly tired at the moment, I am back to working my normal ( longer) hours and do achieve something at the weekends (though not as much as I used to!). So perhaps my energy has surged to almost pre pregnancy levels.
Your body just needs you to take it easy for a few weeks.
I did call in sick with tiredness once during that horrible period too. Not something Id normally condone, but I was all the better for another day in bed!
Stick with it. You're bound to start feeling better in a few weeks. I wouldn't make any permanent decisions about cutting hours and dropping pay (and affecting mat pay) until at least week 16/17 when you see how you'll be feeling through 2nd trimester.
I was surprised as although I knew sickness might be expected in first 12weeks I never knew the "knocked over by a bus feeling" is also normal for the early stages.
Hope you feel better soon.