Do you ever feel like ur heart is working extra stronger and pounding?

Faster? lately i haven't been sleeping early... i sleep like i 3 or 4 in the morning.... That's because i don't work anymore... i noticed my heart beating kinda faster and i been tired and outta breath.... I try to not think about it and lay down and breathe slowly and it goes away but when i'm standing up or doing something, it's beating fast and i'm out of breath.... 😭it doesn't hurt just outta breath.. i know it has to do with that im not sleeping normally .. Also i took a pregnancy test yesterday and it wad positive but don't think i'm pregnant at all because the last time i was pregnant i didn't feel like this.., And right now i have no other symptoms other than outta breath..., anyone else feel like this???? and got found out they were pregnant????