sex marathontakes alot... actually it all depends how ready your baby / body is.i know how anxious u r. but, unfortunatly the best thing, is wait.... it will come for sure.
Having sex to induce labor, only works on some people. some other tricks i have hear you can try are stimulating your nipples it produces hormones that induces labor. But when ever your prince or princess is due on this earth they will be here.Good luck and God bless