Pregnancy 4 weeks after miscarriage?

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Has this happened to anyone? 
Not me yet but was just wondering if my one has had a viable one... 
I had a mmc 4 weeks ago (baby was 12 week) and had d&c 4 weeks ago and another 2 weeks ago for retained products. 
I have been fertility monitoring and finally got some high fertility on clear blue and then peak fertility yesterday (also confirmed on Internet Cheapies). 
I'm hoping I'm ovulating but has anyone conceived this soon after m/c without a period?