15 weeks and 3 days, don't feel pregnant & nervous?

So as you can see I'm 15&3

And don't feel pregnant at all. I didn't feel pregnant before, never dealt with morning sickness (not even once) only time was I got nauseous one night.

Lately though I've been completely normal, if anything I've been getting more headaches, my body hurts like someone just jumped me 😭 and I've been feeling "out of it" can't focus on anything.

I don't know why but I'm scared that when I go in next week they won't find a heartbeat or something,

I'm just wondering if anyone else feels this way? And if it's normal to not feel pregnant at all in the second trimester