How do i tell if my platy's pregnant

[Fish4u]

How do i?:confused:
I've seen my swordtail chase her,my guppy and my platy.Is it possible that I could have cross-breeding?
I see this weirdish sorta light mark on her but it's not gravid.she DOES kinda look fatter than before.Can you tell without a picture?
Pleez HelP!:eek:
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20 gallon tank w/
3 guppies(male)
3 platies(2 male one female)
1 swordtail(male)
1 cory
1 algae eater

[sisco16]

yes they can cross breed and it is possible for there never to be a gravid spot ive had fish that one never has shown up just cause of the coloring on the fish or just dident get one but still had babys :)

[Fish4u]

Do u think she's pregnant or do you need a picture?

[mr gerbil]

Too early to really tell. Look again in a couple of days to see if she's plumper.

[Fish4u]

thx and bye.