I have several apps outstanding. I applied in December. The original email from one school telling me that my app was complete said I would hear a decision within 6 weeks. Since my numbers are above the school's medians and it's been over 12 weeks and still no decision, I called on Monday and asked what was going on. The woman didn't seem to mind that I had called. I personally like to call and inquire, and not email. The admissions people are probably sick of dealing with applicants at this point. It's easier for me to be nice and effectively express my gratitude for their help over the phone. I'd go ahead and contact your schools. They shouldn't get mad if you just do it once.