In your 1st pregnancy, the foetus might not have been well formed n so the heartbeat was missing. Now that u have successfully conceived let's concentrate solely on this pregnancy.
Next Steps
Increase in your stress levels interferes with the growth of your foetus. Growth of foetus could be detected on scan only.
Health Tips
On the scan itself, u would get to hear the heartbeat but repeated scans ate not advisable as it's harmful to both of u. Smoking or alcohol consumption if any should be strictly avoided.