Deborah, everything will be fine, don't fret over this. Soon you'll have a new baby whose sleep you will worry over and toddler sleep will not seem like an issue. Riley was starting to drop his nap while I was pg with Kate, but I hung onto it as the nap in the day suited me fine as I rested then too, and the late nights were annoying, but manageable.
Riley was 2.5 when she was born, and they both got sick with RS just after she came home. Sleep went crazy, then I decidied to drop his nap. We got 12 hour nights. He did wake a few times when I was doing night feeds (I still cosleep with Riley and Kate is in our room too, an added element to deal with). But over the space of a few weeks, everything settled down and now he will do 12-13 hours consistently. It will be fine, it really will. I am so over naps, can't wait til Kate is done with hers, long way to go for that lol.