HSG test vs Transvaginal Ultrasound?

Michelle 💕 • TCC #1 for 2 long years... Mentally & physically drained
Which one is more effective at determining if your fallopian tubes are blocked? I had the the ultrasound done in Feb. My doctor said no blockage. But I want a second opinion. But I want to change doctors and have an HSG done. Which one have you had?