I dont know whats going on with me?

my period was about 4 days late and had been getting very bad headaches i then took a test and i got on line and then the other line was faint but still visiable, i then got my period the next day but only lasted two days i only get my periods for about 5 days but this period wasnt as heavy and as bad. is it possible i could be pregnant i have been very tired and somethings i eat i get natious after and have had very bad mood swings my boyfriend and i did it unprotected but not sure if i should take another test or not?Help please No rude comments