Advice please!

I have 2 girls 18months apart 3 and almost 2.....I have ALWAYS ALWAYS wanted a boy so so badly but had girls instead. Even though I adore both my girls I still have this desire to have a boy. The problem is my husband says that he doesn't want anymore kids because with our luck we'd have another girl, but I can't seem to shake the feeling of wanting a boy sooo badly. Should I just forget about it and move on?