Help! No period and new birth control

Shaquasia
I ended up being prescribed Gildess FE 1/20 Birthcontrol. I'm on my second pack. On my first pack I started on the plecebo pills because I started it while I was on my period. I completely have skipped my period and I'm nervous! I took a pregnancy test 2 days after my missed period but it was negative. I'm not nauseas or anything but I am gaining weight which I think that's a side effect of birth control. Someone please help