Help! Need reassurance PLEASE

I got my first BFP a week ago and the hubs and I are SO excited. I was only 4 weeks but I could swear I ‘felt pregnant’. Then this week suddenly I don’t - I can’t explain it. I didn’t have sore boobs or nausea then and I don’t now.. but I just don’t FEEL pregnant. So I took a test yesterday and I still got a BFP but it was realllllly faint.

It was a different brand of test and it was middle of the day and I’m sure there could be a bunch of reasons but my brain is screaming at me that something is wrong with the baby.

My first prenatal appt is on Thursday but has anyone been through this?! Can someone please reassure me that everything is probably fine? I’m a nervous wreck. 😣