U could be but did u missed a preiod
Are you due to have your period soon? Sore breasts can also be a pms symptoms. Many pms symptoms Ellesmere pregnancy symptoms.
If your period is at least a week late though, I would test. Taking a test is the only way to know if you are pregnant or not. Nobody here can tell you for sure based off symptoms since they are so similar to pms or even a hormonal imbalance.