OP, what did you want us to say? If your toddler was waking during the night, or sleeping for only 6 hours a night, for example, I'm sure you'd be getting lots of advice.
However, she is sleeping more than 12 hours a night, which is far more than many toddlers do. You can't really expect her to lie quietly in her cot when she wakes, as well as sleeping for up to 14 hours. It isn't fair on her.
Many of us on here are parents, and many will be single parents, so you'll find support when you need it - but you really need to get this sorted before the new baby arrives.
If you're in early pregnancy at the moment (I'm just assuming that from the morning sickness, but I know it can persist), you need to plan how you'll cope later on when you're getting heavier/less mobile.
Are you newly single? Are you at home all day, or do you go out to work? I'd prioritise getting some support - even if it's just making friends locally - before the new baby arrives.