Parenting - Have I got it all wrong?

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Many people seem to be doing a spectacular job at parenting so I sometimes wonder if I got it all wrong. I am a parent to 2.5 yo DS and currently pregnant nearly in third trimester. I work 4 days a week and then he is in nursery and we are home on Friday.
I have started to dread my Fridays off now. I feel utterly exhausted as my son is awake between 5-6 am, he is becoming more stubborn and resists his naptime. DH is very adamant that he shouldn't be watching TV so it mostly falls on me to keep him entertained. I am feeling increasingly exhausted and 16 hours long days are taking a toll on me.
DH doesn't seems to understand my exhaustion due to pregnancy as well as me feeling more emotional and irritable than usual. We have very different views on parenting and we tend to argue a lot and my resentment seems to be building up because of constant early days. DH does night wakings and DS keeps waking up 2-3 time a night hence I am the one who gets up when DS is finally awake in the morning. I feel like I am at a breaking point now and I need to learn new parenting techniques as DS doesn't seems to listen to most things I say and DH keeps blaming me that my parenting style is too permissive that he never seems to listen to me but I think he's still too young and he will listen to me once he's bit older.
Any advice on my situation is gracefully accepted. Thank you.

It is completely exhausting looking after a toddler while you are pregnant. I'm usually strict on TV time but when I was really pregnant I could only get to about 2pm each day before I was spent. I used to put the tele on, cuddle up on the sofa with my 3 year old and have a nap while he watched cbeebies. He had a bit of a shock when my energy (and caffeine) levels were back to normal because the TV was taken away again, but he enjoyed those cuddly afternoons on the sofa while they lasted .

Other things you can try that don't require much effort:

Reading, especially books that have loads of things to see or find in the pictures.
Kinetic sand.
Playdoh.
Play sink with a real tap.
Sand pit/water table.
Sit in the car with a cup of tea or coffee and let them sit in the drivers seat and pretend to drive somewhere.
Or just set some toys up, join them for 5 or 10 mins and then when they get into it you can withdraw a bit and they will often play on their own without needing you to play.

Just do what you got to do, it won't be forever. Best of luck!

You know you're an equal parent and your husband doesn't get to choose? When you're the one responsible for your son, you make all the decisions. If it's so important to him, he can work four days a week and spend the other three days entertaining a toddler for 14 hours.