M.T.
Hi Y.,
Many women do continue to breastfeed when they're pregnant, and some tandem nurse after the new baby is born. If you really don't want to wean, get another opinion, preferably one who is familiar with breastfeeding. OB's don't have training in lactation.
If your daughter is used to nursing at bedtime, the easiest thing would be during these early days, for someone else to put her to bed. I see that your husband works long hours so I'd guess he is not an option but if you have a family member or babysitter who can take over in the evening for a few days, this may ease the transition for her. If she was still nursing during the day, wear clothing that isn't conducive to nursing and doesn't show your breasts.
One important thing is to replace the closeness of breastfeeding with plenty of other cuddle time.
It's normal to have feelings of loss or sadness when you wean your baby from the breast, whether it's unexpected or planned. The transition away from the breast is a transition for both mom and baby. Hugs to you and your daughter!