I'm slightly concerned that you haven't considered the preparation time needed for your big day.
You really should plan your day for three years' time, so that guests are supremely fed up with your bridezilla behaviour before they even get to the wedding. This sets the right tone, I think, for such a wonderful event.
If you can arrange to have your long-divorced, really-should-have-got-over-it-by-now parents sitting on the same table, they will love you for it and will not hesitate to let all and sundry know the full details about the divorce. Guests who have never met them before will delight in listening to your mother witter on endlessly about your father.
Do ensure that you place expense of venue above atmosphere. Your guests will admire the fact that you can blow many, many thousands of pounds on a posh golf club 'do' when they are sitting in a cavernous, echoing room with nothing to do except gaze longingly at the escape route exit.
Or, choose a venue that's so small that you have to squeeze people onto long tables in a space fit for a table of four. Put the pregnant woman in a seat right at the end of the table, furthest away from the loos, so that she can't get out until everyone gets up to go. She'll love you for that.