Yikes, I feel for you!
Potty training was the hardest thing my daughter and I went through. I was shocked, because she's so bright and picks up quickly on everything, but she was NOT INTERESTED! The problem with the "wait until they're ready and tell you" approach, is that not all kids get ready! And they get more and more in the habit of depending on their diapers (and the routine of mommy helping them) as they get older, which is what happened with us, and looks like you too.
At 2 and 1/2, I could tell my daughter was getting more and more opposed to using the potty, not more and more ready, so
I took the aggressive approach, fed her a lot of juice, took her to the potty and sat with her every 40 minutes or so after she drank a drink, put her in real panties, and dealt with the endless accidents. I can't count how many times I wiped up the floor and heard her screaming at the horrid feeling of wet panties and kept myself totally positive and supportive while secretly getting SO frustrated. Pooping was another challenge, I ended up having to hold her down with a hug long enough to poop when I knew she had to go, since she would REFUSE to stay on the toilet. I was making up fun games, reading books, staying cheerful and just letting her cry when she didn't want to poop on the potty. Then of course HUGE celebrations whenever she went. It took about 6 weeks and then it all clicked.
There are those who would say if I waited longer it would have been easier, but I know this wasn't true for us. Everyone who knew our routine agreed she was getting far too used to the diapers and showing no interest in the potty long after she was waking up dry and saying she needed to go etc. If I had to to do it all again, I would have started earlier, even though age does not matter. I feel she personally would have made the change easier a little sooner.
I feel for you in your pregnant state! It's A LOT of bending over to help with the potty and cleaning! You may want to wait until the baby has been born and you are a bit physically recovered. The first time I tried, I was pregnant, racing the clock (extra stress), had to give up, and trained her after her brother was born. You will have time while your new one sleeps so much-this is what I would do! Wait, and then take the pro-active approach-shes waited long enough! Good luck!