I will disagree with RP and Mono a bit. Now is not the time to tolerate attempts to manipulate you into monogamy or not spending time with whomever you love.
Now is the time to focus on establishing your new career firmly and focus on getting into the swing of parenting. That doesn't have to involve a manipulative partner given to drama.I certainly won't recommend limiting yourself to C and all that entails--time is too precious to do so. You will have more than enough stress with the new work and the baby to limit your relationships in that artificial fashion, for it is those relationships that will be your support during that time; limiting yourself to, essentially, the most stressful of them won't do you any good. It can also lead to you feeling trapped a couple of years down the road.
So, I'll say focus on taking care of your needs as you learn the new career and being parenting. Ignoring that sort of thing is not a good idea.
When speaking of various forms of non-monogamy...it ain't poly if you're just fucking around.
While polyamory, open relationships, and swinging are all distinctly different approaches to non-monogamy, they are not mutually exlusive. Folks can, and some do, engage in more than one of them at a time--and it's all good.