Periods🚨

So. I'm in the hospital with Gastrointestinal problems (I have chronic pancreatitis) and my period was supposed to start but didn't. Now bear in mind that I have periods every other week so my period lasts for a week then I have a week off then starts back over. 
Now I was wondering if some of my medications or something was the fault of missing my period. I'm only 13 (almost 14) and have had periods since January. Since January I've had 4 and this would be 5. As soon as I get out of the hospital I will go see a gynecologist because they're so frequent. It's not fun at all. 
Please help!! If anyone has anything that could help please comment!