tell me about it. i saw the black spot on my guppy 3 weeks ago and i put it in my breeder tank, and while ive been waiting for it to churn out fry my mollies gave theirs and so did my platys, but still no baby guppys!
it takes them about 28-31 days, and if she stresses out you'll see that black spot in her stomach grow small or disappear if shes going to abort the fry. as long as that black is still there, keep you eye on it. leave her in the breeder. her harmones wont allow her to eat her fry but the the others will have a go.
G' luck!