UNPLANNED PREGNANCY. My delayed periods?

Hello Doctor I am 11 days late from my due date of periods. I and my husband are not ready to concieve yet and we had unprotected sex. Yesterday, I did check myself with the help of I-Can in the morning and the results were negative. I brought three kits, out of which I used two of them yesterday (result being Negative) and today I tested again in the morning and found it negative. There aren't early signs of pregnancy as such but sometimes I feel minor cramps in my lower abdomen. I have recently started my dance workout sessions. Can the exertion caused due to dance be a major cause of my delayed periods? If not then I would want to know what should be the next step after this, as I don't want to further extend my days and miss chances of having Medical termination of pregnancy, if at all I am pregnant. Kindly revert back soon with your assistance on this. Thanks and Regards