Maybe Pregnant after D&C...

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I had a D&C at 8 weeks for no heartbeat and I am still waiting on my 1st cycle (8 weeks ) now. Doctor scheduled me for an ultrasound in 2 weeks since I should have had a cycle by now. I am afraid that we got pregnant too soon (hubby's weak pullout game) since the doctor told us to wait until after 2 cycles. Thoughts?