flashy smile on opk 18 days after miscarriage?

Help! TTC #1 after 7 week baby decided to be an angel 👼🏼😔  I am showing a flashing opk 😁 this morning 18 days after miscarriage? 
Is this normal? 
How many of you tried and had a successful pregnancy after getting pregnant soon after miscarriage? 
Any suggestions? 
I appreciate any help. Thank you!