Go with your gut! And in this case, I think your "gut" and your whole body is clearly saying....REST! I applaud you for listening to your body!
I had to work through both pregnancies, but with the first I was able to decrease my hours by 20% and then take off the final two months, which was huge for me.
Basically, by the 7th month I was having such huge anxiety attacks each morning, that I couldn't leave the house without throwing up, getting dizzy and crying my eyes out! The work was too hard on my body and I was worried that I was harming the baby, so all that stress caught up to me. The doc let me leave 2 months early and I did not get bored one bit! I rested, exercised, read, got the house ready. It was awesome.
If you are in a financial position to take a break now, that is a rare thing and I would totally take that opportunity. Your job will understand, especially if you were going to leave in November anyway.
Congratulations! Listen to your body! Get a new hobby once the morning sickness and fatigue passes, and the months will FLY by!