Nope, that can not happen.
He wants to mate with the female. That is a guppy's normal mating behavior.
Under normal circumstances every female guppy you come across will be gravid (pregnant). My advice is don't worry about it she will be pregnant.
He had a guppy in his fish bowl.Another name for guppy is rainbow fish.The kitten put her paw in the fish bowl to catch the guppy.
It might want to mate with it.
All that is needed is a male guppy in with her.
yes there are. that is how they get mates.
A female guppy has a darker brown line that is visible through its body. The male has a very light brown line.
You can find the gender of a guppy by looking at the anal fin. The anal fin is the closest fin to their tail below them. On a female it will look like a normal fin but on the male their will be 2 long skinny fins. The male is also much more colorful.
That does not happen with guppies. They stay the same sex for life.
That is perfectly normal behaviour for a female livebearer just prior to parturition. She will drop her young soon.
Your male guppy is female and with child.
The Gravid female will have the dark "gravid spot" in front of her vent. I can however assure you that if there has been a male in the same tank with a female guppy for any reasonable length of time she will be gravid.