chemical pregnancy?

Kara • 26 years old, married to my best friend and mommy to my sweet boy. ❤️
Four days before AF I had implantation bleeding. I was 8 days late and took multiple pregnancy tests. The first one looked positive but was a vvvvfl so it was hard to tell. I kept testing every 2 days and they were all negative. Today I had some bleeding and I am so crushed. I just want to be a mom and make my sweet Hubby a dad! I'm not sure if it could just be spotting or if it's a chemical pregnancy. I haven't had any cramps at all so far and the bleeding isn't heavy yet. Anyone with experience in chemical pregnancy can you help me understand better?