Be a single mom until you received your PR coz it is more easier for you to apply your husband later after getting your PR status. Don't be in a rush because your pregnant. Let your baby deliver and I believe being a single applying for PR is more easier and if you have your PR get married to the father of your baby and then apply him for PR coz as far as I knew it will just take 6mos after you apply. good luck and congrats for your baby..........