Well, any time you have unprotected sex, you've risked pregnancy. But women ARE late all the time. Reasons we can be late include stress, illness, changes in routine, weight gain or loss, or just a blip in the hormonal radar. Your cramps could be your period getting ready to start. So, the timing doesn't sound 'right' but you never know. Symptoms really early in pregnancy are so subtle that they are unreliable to use to gage whether we conceived or not. Most don't start until we are 6 to 7 weeks into the pregnancy. That's how long it takes for hormones to build up enough to cause the symptoms such as nausea. Cramps and breast tenderness are hormonal symptoms often associated with PMS as well. I'm guessing your period is about to start. But, you'll have to test to find out if it doesn't. You can test 2.5 weeks after unprotected sex. good luck and come back and let us know!