The Flea

I feel that "The Flea" is about a couple that had sex outside of marriage and now they are pregnant. The flea would be the child from the line "And in this flea our two bloods mingled be;". Another line that states the flea may be a child would be "This flea is you and I,". Then when it goes on to say "Thou know'st that this cannot be said A sin, or shame, or loss of maidenhead," means that it can not be told that the child is from them because it is outside of marriage. Another line about the child being outside of marriage may be "Though parents grudge, and you, we are met, And cloistered in these living walls of jet.". At the end of the poem it seems like the couple is scared for the baby's life and their own lives.