confused ??!?!?!?!?!? after a miscarriage

Jessica
Okay so I had a miscarriage on April 18 and this morning I woke up just thinking I should test this morning I got a positive test line could this be possible we have had unprotected sex. Woke up really stuffy in the nose and face headaches feeling tired lower back aches any advice has this ever happen to anyone that expenericed a miscarriage