Hi, I used Nordette as ECP and I'm getting worried that it did not work. My last period was last June 14-20. We had unprotected sex on June 22. Although it was already the 2nd round and he was definite that he did not spill inside me and he was far from cumming when we stopped, i still know that there are possibilities of premature ejaculation. It took me approximately 57 hours after to take 4 pills of Nordette then 4 more 12 hours after. I experienced nausea, back pains, and became very sleepy the past days. Are these effects of the pills or early signs of pregnancy? I took a pregnancy test yesterday to check. It was negative, but I'm worried that it still might be early to check. What are the chances that I'm pregnant? Please help me.