Symptoms disappear??

I woke up yesterday without and morning sickness. For the past week I've been bed ridden because the nauseating feeing lasted all day long. I've also the bad very sore nipples and terrible night sweating. Today I also feel fine, not a hint of sickness, my nipple soreness as decreased and no sweating last night. I'm really freaking out. I'm 8 weeks on Monday. Has anyone had this happen before and everything be ok. I'm worried I might be mosscarrying. I've thought of buying a pregnancy test today. Btw I discovered I was pregnant at the er via urine sample. I was 6 weeks then.