Is it normal that early pregnancy symptoms come and go?

Lola

Hi everyone! I'm 5 weeks pregnant today and have been experiencing fuller breasts and a higher walking heart rate since I tested positive the day I missed my period. But today, my heart rate dropped today, and now I'm getting paranoid 🙈I've had an ectopic pregnancy and an early miscarriage before, so I don’t really know what a healthy pregnancy should look like. Did anyone have symptoms come and go? 🥺