Miscarriage or not

I’m a 34 almost 35 yo female and been trying for about 4-5 months to get pregnant . So 2/15 was first day of my last period. Was due 3/14 and didn’t get it took a test and was positive . Saw doc yesterday urine test confirmed and blood test did too. They did ultrasound yesterday but really couldn’t see much - did see a gestational sac . When my blood work came back today, the hcg levels were higher than what the ultrasound showed and now today I have very very faint but browner spotting ( started early this morning ) - and not really staining underwear .. like a a dot or two- or four max - very faint - also have some lower back pain now. Progesterone was a 7 and should be a 10 they said - so they said most liking I was miscarrying - I mean worst news ever - it tore me apart / but they are repeating blood work tomorrow to see if hcg levels rise still which would mean maybe they are not right . I can still see faint color when wiping - not sure if it’s on browner or redder side - I feel the way I would when I would get my period - just not as intense with cramps - at least not yet - Any thoughts suggestions or help? Please I have to wait till Friday and this is torture .