Yesterday i, was really excited about getting fish, My dad let me pick out 3 fish, so i got 3 platys now i put them in doing what the guy told me to and it was fine, so then later on i came back and i got a drink and stiff i shut the aquarium light off and the male was hitting the female and when i saw it i think the female ran away was it because i saw them? And how do they mate and how long will they be pregnant for?