I did an abortion but didn't bleed. The u/s showed 5weeks and 6days fetus and no heartbeat. Heartbeat would still be possible at 7 weeks and 4days?

No. If you had surgical (d;c) abortion the pregnancy was missed. If you used Cytotec (misoprostol) to induce termination it was unsuccessful. If there is a heart beat at 7 weeks and 4 days either the first heartbeat was missed or a new pregnancy was conceived. The abortion unfortunately was unsuccessful . Contact your doctor.