Help my female cat had kittens 4 weeks ago... past two days she started acting different... she follows us around meowing,its not for food... and we can't figure it out. She's a good mommy... could she be going into heat?male cat isn't interested so I doubt it... its non stop like she's trying to tell us something... but what?

Love and pat her and give her attention. Are the kittens following her? Please get her spayed, by the way, or get the male neutered. You drastically shortened their lives if you don't get them fixed.