possible missed miscarriage

Lois
Doctor thinks I'm having a missed miscarriage :( 
Literally heartbroken.
I had a urine test at docs a week ago and it showed negative but I've been having faint positives for 10 days and most of them minus a couple have not got darker but digital ones showing pregnant 1-2 weeks meaning 3-4 weeks pregnant but I'm actually 5 weeks tomorrow. 
Have been having cramps in my belly for 5 days but no blood. 
Docs did a urine test today and still negative. She said after this time it should say positive. But all of my home ones are still positive. I haven't had any negative tests!!!! So I'm very confused. 
I have a blood test on Monday to confirm. 
Anyone else has this? :(