Disappearing symptoms

Can symptoms come and go early on? I just found out I’m pregnant 2 days ago and only 3-4 weeks along at most. I had a slew of symptoms that just made me know I was pregnant. But today pretty much all of them are gone. My boobs aren’t even heavy feeling (although still slightly droopy—unfortunately). I’ve been pregnant once and my worries of something going wrong is so bad. Anyone else experience loss of symptoms?