Need some insight

Belinda • 34 year old married with 4 kids.. I`m praying amd hoping to have 1 more child.
I'm 34 and already have 4 kids. I have my tubes cut burned and tied and I know 1st hand that I can still get pregnant. I need some advice. I am 5 days late. I've been emotional, tired more than usual, nauseas every once in a while, and quite hard to handle. I took a pregnancy test and it came out negative. What else could be wrong???