Help!!!!!!

AM

Ive had 3 positive pregnancy test first was Saturday then Monday and then this Wednesday. The test we’re getting darker. Thursday I started spotting and have continue to today. Today I also had an appointment due to my cycles being irregular they did an ultrasound both transvaginal and abdominal and saw nothing. They said I could just be early they Drew labs and my levels came back at 71. I’m unsure whether this is a good sign or not.