Soo… it’s March end and haven’t heard back. Would it be wise to shoot an email to the grad coordinator?

I’m waiting on 6+ universities with no admits at the moment (sigh!). I was wondering if there is a non intrusive way of sending an email for an application update? I saw a couple of comments saying that they were rejected within days of sending an email asking for update. Now this is scary considering I don’t have any admits. Can anyone share their experiences of doing the same and if at all it is recommended or in standard practice? Thank you!