Pregnant naturally after ttc - terrified of miscarriage

We are pregnant after 5 years of TTC. I have been spotting mostly brown with the exception of one red spot (at 3 am a few nights ago- got no sleep after that). Now it’s lighter like an orange ish color abd then it went back to brown. It has been happening since 4 weeks and I’m 6.5 weeks now. I have all the tell tale signs of miscarriage: lighter pregnancy sticks (not by much), cramping, reduction in pregnancy symptoms, moody, etc. my lower back started hurting yesterday and I was like no I’m making this up. I’m not. It’s a dull ache. My levels look fine but I’m due back for an ultra sound on Friday. I have to go by myself because of stupid covid. I’m so afraid they won’t find a heart beat and it will be all over. I’ve never been pregnant before (that I know of). I’m just so terrified. Has anyone else experienced almost every symptom in the book and still gone on to have a successful pregnancy? My only fish factor is being over weight (I lost 40lbs this year so I’m trying bot to beat myself up too much over the fact that I’m still overweight). Actually my other risk factor is unexplained infertility. I was so focused on getting pregnant I never thought about the horrors of being pregnant- mostly because I truly never thought I’d be. I’m having such a hard time.