Jacob is obviously a lot younger, but I recently discovered that when I needed him to stay in his bed, I went to him while he was crying and leaned over and put my face on his, kissed his face repeatedly and didn't say a word. He tried to push himself up a few times, but I kind of flattened him (gently, of course) and he went back to sleep for hours. I was lucky and I know something like that would be difficult for you because you are pregnant, but maybe you could try something similar. We found that when we were picking him up while he was crying, he would wake up more and not get back to sleep until I fed him again. The patting and shhhing didn't help- we had to form a kind of human swaddle.