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It sounds as if your tomatoesIt sounds as if your tomatoes are flowering. The flowers turn into fruit.  (So don't pinch off any flowers!)  If the flowers are present but they are failing to set fruit, the common reason is high temperature. If temps go over 85 degrees F during the day and 75 degrees F at night, tomatoes will have trouble fruiting; you need the weather to cool down. Similarly, when temps get cool and daylight increases, the tomato plants will stop growing.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?