Congrats Tabitha! It's really exciting!
I have seen some people on here who got bfp while NTNP and I know someone who who got pregnant 2 months after the birth of her last child, I don't think they were officially NTNP but obviously not taking precautions!
I have no idea about a name, I'm useless at those sort of things!
My only first symptom was a feeling of complete calm. After I got my bfp the bloat was unbearable lol I was in maternity clothes because my bloated belly was massive! That died down a lot after about 10 weeks though and I barely even got a bump until about 34 weeks (which shocked me because I'm not exactly a small lady!)