"The Flea"

This poem seems to be about a man and a woman, who seem to be just newly married, and now have a baby on the way.  I think that the "flea" or the child dies when being born and it kills the mother also during child birth.  "And pampered swells with one blood made of two," this is what tells me she is pregnant (8).  This sounds like they are but barley married,"Where we almost, nay more than married are (11).