Confused by mix of pregnancy results


I’m 3 days late on my period. I did 3 pregnancy tests on Sunday & all 3 came back clear positives. I’ve done another today at home and one with the doctor. They have come back negative. I have really sore boobs, back ache & feel different. I’m so confused & I am hoping I’m not having another chemical pregnancy. Has anyone else experienced anything like this & gone on to have a healthy pregnancy? I’m 39 & this is my last chance I feel.