Maternity leave to soon ?

Stephanie
I work in a hospital in the south end of Boston. On a med surg floor, and we see a lot of drug addicts and alcoholics. I'm on my feet for the entire shift and for the most part it's not so bad physically but mentally I've had enough!!! I'm 22 weeks and last month had a patient kick me, before I was pregnant I could handle the disrespect but NOT anymore. I'm wondering if it's to early to take maternity leave? What do you ladies do & when will you take maternity leave?