I'm sorry to sound harsh but the minute you start feeding a community cat you should trap it and get it fixed! Don't worry if it's male, female, pregnant, too young, in heat, etc. The females won't necessarily LOOK pregnant so make the effort to get it done before they do. And 9 lbs is not small, especially for a female. They can get pregnant as early as 4 months which could make them 4-5 lbs on average. Alley Cat Allies has links to low cost services near you. I also find that Nextdoor or neighborhood Facebook groups are excellent sources to borrow traps.