I am excited out of my mind, but wonder what are common problems for two people that are only used to seeing each other on weekends that will now be together almost every day. Well, gee, everything. Not knowing you or the boyfriend, I can't predict what your problems will be. All couples have them and most problems are unique. Pardon my convolutedness, but problems aren't the problem.
All relationships have problems.
What can be problematic is if the couple doesn't find constructive ways to work on their problems. I had a girlfriend who has gotten pregnant with my child. The only problem is that she does not want me to see it when it is born. You have a legal right to see your child and unfortunately you can't avoid involving lawyers if your girlfriend is going to deny you your rights. Sometimes a lawyer is a godsend.