It depends on the context, for example if this is meaning he is not already the father but will be in the future then yes it is foreshadowing.
The Friar points out that Romeo is a <em>Fickle.</em> Romeo argues that the situation with Rosaline was a different matter because Rosaline did not return his love and Juliet does. The Friars motives are to help end the feud between the families, while the couple's motives are to be together because they are in love.
I hope this helped you!
