Most women don't usually experience much pregnancy symptoms until 3 weeks into their pregnancy but sometimes it can happen earlier.
Signs that you may be pregnant are tender breasts, nausea, missed periods, spotting or implantation bleeding, cramping, Vomiting, cravings for more food, headaches, mood swings etc.
When pregnant you'll usually have frequent urination too which means that you'll be up and peeing more often and you'll usually experience back pain while pregnant too.