Ways to make $500 or more over 3 months?

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I want to make an extra $500 over 3 months. Looking for ways to achieve this modest goal. What can I do temporarily to make a little extra money? Nothing illegal or morally depraved, please. I'm willing to work hard for it - even take a part-time job, but not one that has shifts longer than 3-4 hours. Not interested in starting a business, though. I work 5 hours a day, 4 days a week. For now, this can't increase, but it leave me with extra time to earn. I take classes in the evenings, but they will end soon. I don't have stuff to sell at a garage sale. I don't have special skills, but I'm well-educated. I don't drive. I don't mind doing physical stuff, but it can't be too intense as I'm three months pregnant. What would you do if just wanted to earn a little extra money in the short term?