Swine flu help please?

okay tomorrow i have a doctors appt and they are going to be offering the swine flu but im undecided because i think they havent studied it well....to make it clear im almost 9 months pregnant and i heard it doesnt work right till like 3 months after u get the shot so help i need opinions do u think i should get the shot or not....im always home so i dnt really be going out