Hi,
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The symptoms that you describe are suggestive of early pregnancy. They occur due to changes in hormonal levels, changing pelvic environment and uterus growth along with baby, and your body responding to these changes. Do not delay in confirming the pregnancy. If you develop any danger signs like bleeding, spotting, increasing intensity of abdominal cramps etc, then these could signal chances of miscarriage. Take adequate rest. Drink plenty of water. Maintain healthy diet. Be in regular follow-up and monitoring of your treating gynecologist/obstetrician and report any unusual/abnormal/new symptoms immediately. You can also consider requesting your gynecologist/obstetrician for getting serial HCG levels tested. Doubling up of the hormone levels in 48-72 hours will show that pregnancy is going on smoothly.
Take care.