Confusing test outcomes

Hey girls, I need some help..

Two days ago I had a pregnancy test that came out positive (with a thin line, but it was!) the next day I had a blood test for beta HCG and the result was 33.54mlU/ml. I went directly to the gynaecologist but the ultrasound didn’t show anything yet (but I’m aware it might be probably too early since my last period started on 09/08/24)

This evening I took another pregnancy test which turned out negative. I’m very confused since I feel mild cramps, exhaustion, mood swings, and very mild nausea… maybe some of you had similar experiences or just can tell me if I should consider myself pregnant or not.