Woo hooo a BFP!!! What to do now!!?

So i'd only be a bit over 5 weeks i've taken 3 tests over the last 3 days lol 2 were the confirm brand and the other i used today was clear blue which is meant to be the best all 3 were positive lol (i had to be sure)!! anyways i have a doc app on tuesday, wat to di till then!! i'm so excited but really scared now just hoping all is well with the tiny little bubs!! I also smoke and really want to giv up 4 the baby's sake and all to go well thru the pregnancy does any1 have any cold turkey tips?? Thanks to all replies :-)