Hi, welcome to the ehealth forum and I am glad to help you.
You seem concerned with left sided hard and tender breast. There are lots of causes for this besides pregnancy, most of which are hormonally related. This may be due to hormonal imbalance, premenstrual syndrome (PMS) or fibrocystic breast condition. Fibrocystic breast tissue contains lumps and bumps that tend to be tenderer just before your menstrual period. Perform a breast self-exam 3-5 days after your period (when the breast tissue is the least tender). This is important to feel for any changes in your breast tissue. Any notable changes in breasts should be checked out by a doctor if you are worried because there are breast diseases or infections that can cause conditions like this. If only one breast was affected that would be a bigger cause for concern. You must consult doctor for the definitive diagnosis and treatment as the same cannot be made online.
Hope this helps. Take care.
Note: This post is not to emphasise final diagnosis as the same cannot be made online and is aimed just to provide medical information and no treatment suggested above be taken without face to face consultation with health care professional.
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