Need Advice: Job interview for urgent care center

I am an LPN student who is graduating in 5 weeks (yay!) I have spent the last few months applying for both clinical and clerical positions at hospitals/clinics etc to get my foot in the door somewhere. I finally got a call for an interview for a weekend front office position at an urgent care center near my house. This is not a clinical/patient care position. I am kinda nervous about the interview since I figure they will think I am only interested in this position until I pass boards, and then will jump ship. I made it quite clear on my resume that I am graduating from an LPN program in December, so I definitely wasn't being dishonest and would actually love the position. Also, I am currently 16 weeks pregnant and would probably not even be able to work as an LPN for at least 6 months. (I do not want to inform the potential employers of my pregnancy though) I don't even really know what I'm asking, I just don't know how to approach the interview. I do not want to be dishonest and lead them to believe that I am looking at this position long term, but I don't want to be discounted because they think I'm not serious about working there. It is after all, only a p/t position. The urgent care center is actually within a network of several hospitals/clinics/Private Practices and the network uses LPN's quite extensively. I would love to get my foot in the door w/ the network and would even love to work for the urgent care center as an LPN eventually if possible. Any advice? TIA