Advice pleaseeee

Kaili • 25 years young ttc my number one have 2 wonderful sons that are from my husbands past relationship. EMS

Ok so i took a test 2 weeks after my period was due didn't come took a test and it was positive just to be safe went to the doctor and it was negative... I've been feeling a flutter feeling in my lower stomach like something is there. I've also had morning sickness weird cravings and really bad lower back pain. Should I go back and demand a retest or just leave it be.