Return of Period???

Ha

I had a D&C on March 21st, bled for about 5 days, then started what my doctor said was a period on April 4. I tested positive on OPK on April 20th. I have yet to have a period again, but keep having BFN. My cycle has been 37ish days. Anyone have a similar story? When will my period come back? Is this just a response to miscarriage/D&C? It’s so disappointing to keep reading a BFN, and still not have a period.