My period is due tomorrow. 2 days ago I got a very faint positive and it’s been getting darker every day

1st vfl

2nd vfl

Then this is from this morning

I got my blood drawn today to check my hcg and it’s only 15!!!! I’m very very worried that it’s too low! I had a miscarriage in April and we were really hoping that we were getting our rainbow baby... I go back on Saturday to check to see if my levels are doubling but I’m not having very high hopes.

Have any of you gals had levels this low and everything turn out OKAY?