The white stuff on the side looks like either the start of algae or calcuim or hard water stains. Get a $7 aquarium scrubber and take it off. Easy.
Did you get the test kit? Did your tank cycle through?
Pregnant mollies: Your fish, even your pregnant molly, will think the babies taste good. If you want to keep them I suggest getting a separate CYCLED tank for the babies. They give birth to 10-60+ LIVE babies at a time and need to be fed between two and four times a day. For the best survival rate, when the mom is close to giving birth move her to an aquarium breeder. Once the babies are born you will need to remove the mother. Once they are safe from hungry fishies you need to feed them crushed flake food, or first bites, or baby brine shrimp, or...just about anything for baby fish. Good luck!