Can this be a sign of early pregnancy? FATIGUE?!

Hi ladies! So I am a nursing student, I’m getting my RN right now, and I just finished my second to last term... (graduation in 10 weeks yay!!!)

So my school is about an hour away from my house and I take morning classes. I have to be in class by 8am so I have to wake up really early to avoid Miami morning traffic, I like to leave my house around 5-5:30am so I can drink my coffee/ study a little bit before class to feel awake and ready... long story short, I wake up super early and can go the whole day without taking a nap, feeling energized and going to sleep around 12/1am... I’m on break now and I’m waking up so late now around 12pm and that’s not like me and now I’m falling asleep around 11pm! Not like a normal sleep... like someone hit me on my head and a fell asleep with my mouth open, drooling, and snoring! (According to my husband LOL) type of sleep.

Also, another thing that I noticed in my last pregnancy that unfortunately ended in a miscarriage, I felt this really strong soreness in my right ovary for a few days and I knew right away what it was (implantation cramping)

I felt the same thing for about 4 days with back cramps as well.... could these be possible signs of pregnancy or are they just mental?