Am I miscarrying?

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In February 2018 I fell pregnant and when I was 8/9 weeks pregnant I started having heavy brown discharge which after a few days turned into bright red blood (lots of it) so I went to the doctors where they proceeded to scan me and told me the lining of my uterus was thick like I was just about to have a period, and basically told me I was miscarrying and unfortunately I did have a miscarriage...

So I am now currently 5/6 days late on my period... Yesterday morning I did a cheap test from Asda that gave me definite 2 lines, I then did a clear blue digital test later on that night which told me NOT PREGNANT. So I’ve waited until this morning and done another cheap test the second line was soooo much fainter than yesterday to the point you could barely see it anymore. So I’ve carried on with my day, I’ve started to have lower left back pains and slight mild cramps in my stomach, I was at work and went to the toilet and I had a bit of brown discharge which is starting to slightly get heavier... I know I am very early on if I am pregnant 3/4 weeks max... but is this sign of a miscarriage again or has anybody had this problem and continued to have a healthy pregnancy?

P.s miscarriages are a big thing that have run in my family, many of my family members can fall pregnant easy (like myself) but struggle to carry the baby without miscarrying :(

Sorry for essay, can someone pls help me 😰