So I got off my birth control about a month ago and me and my husband have been trying for almost 2…

So I got off my birth control about a month ago and me and my husband have been trying for almost 2 weeks and for the past 3 days I have been so nauseous and throwing up my boobs hurt so bad and I just can't keep anything down I took a pregnancy test yesterday and it came out negative and then I took one this morning and it still came out negative. Am I taking them too early. Could I still have these symptoms so early on with a early pregnancy test. I don't know what's going on.