So confused and lost

AF is a week late for her monthly visit and I don’t know what’s going on. I tested today and didn’t see anything after 30 seconds so I threw it in my car and a little while later my husband went to clean our car out and said there was a pretty dark line on it. But as soon as he took it out of the car and the wind hit it, the line got waaay lighter. I see a slight something, but you can’t tell in pictures very well.

For a little over a week now, I haven’t been feeling the best.

I’ve got headaches off and on all the time, frequent peeing and pooping (tmi, I’m sorry), I get light-headed and nauseous, I’ll get really hot and then cold. My boobs are slightly sore and feel kinda heavy.

I don’t really know what’s going on. My period is always on time, even before and after my miscarriage.

Do I have really low hcg levels to begin with?

Is this a bad sign?