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My sword tail has a red spot back towards the anal fin wondering what that is or means. Is she pregnant???
 

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That sounds like a gravid spot. The darker it is, the further along in pregnancy the Swordtail is. In some orange or reddish Swordtails, the gravid spot simply will look a darker red. In pale Swordtails, a pinkish gravid spot can mean she's just barely pregnant and when it gets dark blackish color (that coloring comes from the eyes of the young) then she is heavily pregnant. If you post a picture of your Swordtail I can tell with more accuracy what the shade of the gravid spot suggests.
 
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