I had sex on the last day of my menstrual cycle. It was about 10 hours before I put my nuva ring in. It was on Jan. 2ND. Now my breasts have been very tender and are extremely swollen. I also have had cramps. My appetite has been a bit different. What is the percentage that I could be pregnant. It is too early to test but, it's driving me nuts. What is the best early pregnancy test kit. Do you have any other suggestions?