Cat had kittens, but I don't know where?! Help!?

Put out plenty of food and water and let her take care of the kittens. She has them hidden some place.

She will go to visit her kittens at some point. If she does that follow her.

This happened to me once, this is what I did. Leave cat food on your porch and wait. When she comes, watch from a distance. When she starts to leave she's going back to her kittens. Follow her, but don't get close. Make her think you don't even notice her. She's probably had them in a bush or made a small den like area. When she stops (she might sniff around or lie down) Go towards her slowly. She's a feral and is VERY protective of her kittens and probably won't run off unless she's a first time mom. You should've brought a box/carrier. Slowly and gently grab one kitten and put it in. If she isn't too pissed grab the others. She'll get probably get in there too. When you get them home put them in a small separate room and work on socializing the mom. Hope this helps c:

Keep an eye on her and see where she goes next time you see her around. follow her?

Follow her around.

You have gotten good advise here. The key is to when you find the kittens, wait until the mom weans them and then take them to a shelter. Because those kittens will reproduce like crazy if left out in the wild. There are organizations which spay/neuter cats and release them. Look them up for help to prevent cat overpopulation.

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Cats sometimes carry their babies around.