Tests getting darker a good sign after past chemical

Was very worried when I tested positive for pregnancy yesterday 5 days before period is due as I had a very early miscarriage/chemical last month so I've been worried I might notice of it happens again.

In the picture the first test I took was yesterday and second one today.. because they are getting darker is this a good sign of a impending sticky bean? Still 4 days away from af. I know when I ovulated so also strange how I'm getting strong positives 4 days before af... Maybe twins !!!