My period was on december 1 2017 and i had unprotected sex in the 6th day.and last month i had 37 cycle..is it possible to get pregnant?

Maybe not, but...: Probably depends on how regular the length of one's cycles are. It can be hard to tell if a woman is pregnant because some of the symptoms seen in early pregnancy can also happen in non-pregnant women. A urine pregnancy test gives a reliable result if done correctly. One can test about 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period.