I would suggest you find some really positive ways to connect with her without you exerting too mich energy. What about doing a puzzle together, or playing play dough or coloring in together. I would try those sticker books too. My dd loved doing those together at 2. Spend a few days trying not to watch tv (or only at the usual 4:30 time...I'd die wiout that!) and see how she goes.

My dd has always reacted strongly when I am stressed or otherwise distracted. Slowing down, spending more quality time together and really trying to be with her always helped the tough times pass.

It is developmentally normal for her to cry and throw herself in the floor too. I think I would avoid disciplining her for that, but of course if you're at your wits end, the cot is a great safe space for you both to take a breather (well I'm not sure you'd fit in the cot, but she can play in there while you have a cup of tea).

It tough being pg with a busy 2 yo, so go easy on yourself too. Maybe look at cutting back your work sooner too if you can afford/manage it.