I AM DESPERATE. PLEASE HELP ME.?

I really wanted a job before I go to college so around feb this year I applied like crazy to various jobs. Just recently, one of the stores I applied to finally decided to hire me. That store is Victoria Secrets. Because I was super stoked that I got a job, I told them that I would work for them. However, I have to leave to India and Japan to see my relatives in about a month (keep in mind that I JUST got hired), which would take about 5 weeks. I'm not sure what I should tell Victoria Secrets. If I told them now, would they fire me? Is there any way for me to still have this job? Oh, and are there any contracts that make me have to work at Victoria Secrets for a certain period of time (like 3 months..?) Please let me know because I haven't seen my relatives for 8 years and I won't be able to visit them in the near future because I'm studying for nursing and the courses are very intensive. Please help me!