Well here are two possible stories to follow...tell me which story you want to happen or make your own up.
A. Hope is already pregnant with Liam's baby, but she sleeps with Wyatt. She is head over heals in love with Wyatt. The ultrasound report shows the baby is Liam's. Hope informs Wyatt, he is the Father. Wyatt finds out that he is not the father, by reading the ultrasound report on the doctor's desk, while Hope was being examined. Wyatt breaks up with Hope. Hope runs to Liam and tells him according to the ultrasound report, he is the father of her baby. Liam has a problem, because he was trying to get back with Steffy during this time, but she didn't want anything to do with him. Liam does the right thing and marries Hope in Vegas. Liam doesn't find out, that Hope was passing the baby off as Wyatt's, until he comes back from Vegas. Wyatt told Liam the truth. So Liam is in love with Steffy, but he is married to the lying Hope, who is in love with Wyatt.
Then Steffy an Wyatt run into each other at the coffee house. They hit it off and end up getting married. Hope and Liam are green with envy watching Wyatt and Steffy. Oh did I tell you Wyatt and Steffy have "Twins". ;) :) ;)
B. Liam and Hope are broken up. Hope sleeps with Wyatt and becomes pregnant, but doesn't know she is pregnant. She ends up going back to Liam. Liam and Hope are happy again with Wyatt's Baby growing day by day. Hope finds out she is pregnant with Wyatt's Baby. Liam finds out that the baby is Wyatt's by reading the ultrasound report on the doctor's desk while Hope was getting a exam. Liam tells Hope he wants a divorce, since she has been lying to him about him being the father's baby. Hope still wants Liam, but he wants nothing to do with her. ;(
In the mean time Stefy/Wyatt get married and have those beautiful twins. ;)
C. Make your own story up. ;)