Need some perspective....please

My story - 7yr old son with no complications but now 41. Pregnant last summer but no heartbeat a day shy of 12wks. Had D&C. 
Then positive test on 2/7. Today I had my first appt and thought I should be 9w4d, but measured 6w4d on dr scan and 6w1d on high risk scan. No heartbeat detected on either. Prepared to take medication to induce miscarriage. BUT then got call on my way to the pharmacy saying they reviewed pics and since I was on border for detecting HB they said I shouldn't take meds and come back in for another ultrasound on Thursday. 
Has anyone had something similar happen? How do you deal with the stress and waiting? I don't really think my conception timing is so off, but could there be other possibilities to explain?