Metallic/sour taste in mouth?

I’m 6 days from my missed period.

For about a week I’ve had a metallic/sourish off putting taste in my mouth (yes I brush my teeth lol) is this a possible pregnancy symptom? Also I just felt my boobs tingle and almost like a “letdown” feel( I’ve had kids before and breast fed) idk Im just feel really off. I’m hoping it’s my month! I can’t wait any more I just want to test. I feel like this is my month! (As I’m eating soup that’s making me nauseous🤞)