<s>[INST] I'm 18 and had sex on my fourth day of periods. My cycle is 39 days. And period lasts for five days. My boyfriend wore a condom. But I did not take any birth control pills the next day. Are there any chances of pregnancy? Can I test this using the pregnancy device available at pharmacies? It's only been four days after the sex now. Will the device work? [/INST] Hello,Protected sex with condom on 4th day of period is very much safe. There is no chance of pregnancy and you have nothing to worry.It is too early for undergoing pregnancy test and strip test does not help in this time. Wait for next coming period. If you missed it more than 7 days, you can check your pregnancy status by home pregnancy test.Practice safe sex in future. Good luck. </s>