Help !

Okay!! So my fiancé really wants to get pregnant and I really don't. Sometimes I'm like eh maybe. But in the long run I'm not ready. 
I know there's many reasons why my period could be late. But I'm really regular. 
And I'm officially 6 days late and I tested a few days ago and it was negative. So I'm in the clear right ..? 
I've also been very gassy. Every single day!! No my eating habits haven't changed. With my first daughter I knew right away I was pregnant and was. But now I'm unsure about it all. 
Answers ??