Why is my body so confusing?...

I have irregular periods, however, i dont normally skip them. Until i got married oct 2023. Where ive skipped my period 3 times (now on my 4th time)(cycles are 50+/- days long). My husband and i dont use protection, and we "let it fly" every time since i dont know when im ovulating, and would be happy to get pregnant. (We're not trying, but not NOT trying) Im on cd 46 now. Took a clear blue yesterday, and first response early result today, both are negative. Ive been feeling so sleepy for weeks now, sleeping 10-12 hours a night. My mood swings have been wilder than ever. And my german shepherd has been clingy to me for the last week. Hes been more protective, whinier, and lays next to me wherever i go. Im not getting any other pregnancy symptoms, but the fact that my dogs behavior changed is what is tripping me up and making me think i really am pregnant. But since the tests are negative, im 99.9% not pregnant. So it makes me think, what in the world is going on with my body?! Why are my cycles beginning to be more than 30 days long? And what is going on with my dog? This is now the 2nd cycle in a row being over 35 days (last cycle was 67 days long), and it has a good way of giving me false hope of a baby.