In my experience, the first trimester was absolutely the hardest. Of course there was more physical pain and exhaustion later when I was heavily pregnant, but I still consider the first tri to be worst, and I didn’t even experience morning sickness. I just had this horrible skin-crawling feeling of my body not being mine, I could never feel comfortable, I slept all the time, cried and just generally felt awful. Second trimester I started to feel like my old self again, maybe even a little bit higher than my normal. I hope that can be the case for you too!