Missed Period

Dreaya
So period didn't start on the 6th of this month so I tested on the 7th & negative. Turned astound there was like oh well maybe I'll start with in a couple of days nope so I tested just now in still negative. My question is why haven't I started or am I testing to early? I want to be able to give my fiancé another baby his baby girl. My stomach is upset lately and in become worried. Help please. 😢