Confused

So I got married September 9. My husband & I have been planning on having a baby. But it wasn’t until September 25 that we actually started trying to. I’ve been feeling a lot of pressure in my pelvic & today I woke up with a lot of nausea & having to throw up. I haven’t been able to eat all.

I was driving & I started to feel very dizzy and light headed i just feel like it would be too soon to start feeling symptoms. Either way I went a head & did a pregnancy test & it came out negative . But i just need an answer. HELP PLEASE!!

P.S. the first day of my last period was September 5.