Metal mouth

Ashley • I'm 23. my son is 2 yrs old. And my bf is 24 We've been together for 8yrs in sept. Expecting our baby girl April 14 !!
I'm 25 weeks pregnant today and I just woke up in a sweat. I walked around and got a bottle of water but when I drank it I had a bad Metal taste in my mouth. Why did this happen ? Should I call my doctor ?