early symptoms

How early did you/ can you feel that you have symptoms? Last month I felt like I was sick like I had morning sickness which stuck for about two weeks but off and on and I'm 2 days away from getting my period and my boobs hurt. Me and my bf had sex the last week of November I took a test around the second week of December  but it came out negative, I dont want to buy another test before I get my period but I just want to know if you can get symptoms in the early weeks.