Possibly pregnant

My significant other and I had a lot of unprotected sex (yes I understand the risk of this) I thought I was pregnant because my period was about a week or two late but then I had a period however it wasn’t my usual period I was nothing but clotted blood 🙃 I talked to a few friends and coworkers who have had babies and the ones who experienced this as well now have a baby between the ages of 6 months to 3 years old. I’m perfectly content with being pregnant, I’m actually at ease with it. I took a few pregnancy tests that came back negative but they said they had to take like 6-7 before they finally got there positive results. I’m not stressing about being pregnant, I’m actually excited if I am. I just want some other views and advice.

For the record I am almost 21 years old and my boyfriend is ready to be a father and was devastated when I told him the tests came back negative just as I was.