signs I should look for to see if she is pregnant?

Hi,
Welcome to ehealthforum,
Do not depend on appearance of symptoms alone to confirm pregnancy. The appearance of the symptoms depends on how the body reacts to changing hormonal status during pregnancy. Few women can experience symptoms as early as 24-48 hours after fruitful intercourse while few women do not experience any symptoms at all. The symptoms suggestive of early pregnancy include: fatigue, increased tiredness, increased appetite, increased sleeping, nausea, vomiting, sensitivity to smell, constipation or other bowel habit changes, abdominal cramps, spotting, brown/orange/pink discharge, shorter or lighter periods, breast swelling/tenderness/soreness, sensitive nipples, darker areolas, appearance of Montgomery tubercles around areolas, heavier feeling in breasts, breast discharge/colostrum discharge, appearance of veins over breasts, pelvic discomfort/heaviness, increased/altered vaginal discharge etc. Few women can experience majority of these symptoms whereas few can only experience a few of them. Wait and watch for her next periods. She should visit her doctor/gynecologist for further evaluation and assistance if she does not get her periods within 10 days of expected period dates, or if she develops any new symptoms suggestive of pregnancy. If pregnancy gets ruled out, and if you intend to remain sexually active, she should consider getting started on suitable regular birth control measures to be protected (after her periods). She should be regular with birth control use as instructed. Avoid having unprotected sexual contact.
Take care.