Yesterday practicing I noticed a high improvement over previous days in terms of sound and intonation, I could play all the harmonic series up to high E more or less properly intonated and with a good and full sound tonguing them.
The problem is that today, I picked up the trumpet and after a little time of practice I started to make notes very flat by default, almost more than one semitone lower and I was having a really hard time getting it up to the correct pitch. Also sometimes I get like a "farty" fuzzy sound from my lips like the sound of them clashing too much like if they were too loose.
I don't get why this is. I can think of my embouchure being too relaxed and lips not correctly placed on the mouthpiece and still have problems finding the position and alignment of my jaw