In need of some advice please😕

I went for a early scan on Saturday and they told me that I am 6 weeks (transvaginal) ... but they couldn’t see a heart beat and the sac looked slightly irregular. I am re booked in for a follow up scan on the 21st, I’m having such bad anxiety over this.. am I going to misscarry? It’s putting me on edge any slight cramp I get.

Is there a chance there will be a heart beat at the second scan?

My symptoms are getting stronger e.g tender breast..

Also lines are getting darker on home pregnancy test

Please no negative comments :-(