Interviews/new job while pregnant

I just got a call for an interview!! I am 5 weeks pregnant with my second. I got pregnant with my first when I already had a job so this is a very different experience. My situation is also very odd. I'm in MA school(Monday/wednesday mornings) for the next 8 weeks and then will be going on to a 36-40 hr/per week for 5 weeks unpaid externship for school before graduation where I'll unlikely be able to work or work as much. Once I graduate I'll be 18 weeks along and not sure if I'll be able to get a job in the medical field until baby is born. I'm not sure how this interview next week will go since I'll only be able to work for under 2 months before externship but we really need the money(and I need someway to get out of the house) and it'd be great to have this job after graduation in case I can't get a job as I'll be farther along. This is also my first real interview as with my last(and only real) job they just hired me on spot and I filled out the paper work. Anyone in or has been in a similar situation? Any tips?