### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hi, I used Nordette as ECP and Im 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 Im worried that it still might be early to check.  What are the chances that Im pregnant? Please help me.

### output:

Hi, I understand your concern and shall answer your queries in points.1. Though not equivalent of normal emergency contraceptive pills 8 pills of Corvette can act similar to emergency contraception. 2. The chances of pregnancy are fairly dependent on the timing of sexual intercourse when periods are very regular. Sexual intercourse close to midcycle when you are likely to ovulate is more fruitful than close to or after period.3. Chances of pregnancy are higher when there is deposition of semen within the genital tract. Based on these facts, your chances of pregnancy is remote, though not completely ruled out. Nausea and backache are more likely to be side effects of extra Corvette pills. You may wait until the next expected date of period and if you miss it (which is most likely due to additional pill consumption), get the urine pregnancy test done. Best regards