Hey Mr. Fry - I got your message and tried to reply, but got a message that you could not use the messaging system yet. I don't have Molly experience but am sure someone will be along to get more detail from you about your issue.
Mr. Fry...... Mollies (as with most livebearing fish) will deliver fry at approximately 27 day intervals (depending on your temperature).....
Mollies are easily stressed and will deliver dead fry if you put them into a "birth box thing"..... the best way to retain some of your fry is to have lots of floating plants in the tank where the fry could hide from the adults....
What other fish do you have in this tank with your Mollies.?....
Red stuff on both sides isn't pregnant, its parasites, very very advanced parasites. Don't let the others eat her when she dies else theyll catch it too.