What alternatives are there to TV? I find our TV goes on if I have stuff I have to get done. BUT if I engage with the kids in some kind of game it leaves TV for dead.
Is the alternative to TV an activity with you (like making a snack or building a tower or reading a story)?
This might sound silly, but I have a very hungry 3yo in my house (which is weird because my older daughter has never been a particularly hungry kid - she can take or leave anything *except* treats, she's always keen for those ) sometimes I forget that she needs to eat every couple of hours at least. If she is hungry she can't say, "Mum, I'm hungry", she just gets really whiney and cranky. Just an idea!

It is soooooo hard when you're pregnant (and sick!) to be patient with little ones, hey. But it sounds like she's just needing lots of reassurance. I have found (most recently with my 5yo) that when I react with compassion and calmness I get a far less aggressive child than when I react with time-outs and raised voices. It's a massive learning curve for me as our reactions are often very reflexive and staying calm is such a difficult thing to do when you are tired.

Go easy on yourself. You are doing a fab job.