Your application should have been processed before mine since my application reached HO on 28th.
I believe every Case Worker is assigned a set of applications, for eg. someone might have been assigned applications from 24th - 27th March, and another case worker might have been assigned 28th March - 31st March (just to say).
So in such a scenario, its possible that the applications received later could be processed earlier.
Nevertheless, your application should be under processing and you should be receiving your docs pretty soon.
I never mailed or phoned them for my application status. I just sent a fax in july that I want to get my docs back by a courier. So, when decision on my case was taken, they mailed me telling that decision is taken and I shud arrange for a courier.
Let me know if you have any more doubts.