When can a chemical pregnancy be ruled out?

I have had a chemical pregnancy years ago and although it’s very common I was still devastated! I now have twin boys who are the love of my life! They were born only 5 months ago! I took a test yesterday and found out in pregnant again! Just like any mumma, I’m already attached to this baby! My period was due yesterday. I did another test on frer today and it’s darker.

When can I officially rule out a chemical pregnancy? My chemical pregnancy years ago I had spotting the whole time but had a pos pregnancy test. This time is different.

Am I pretty safe it’s a healthy pregnancy?