What’s something you wish you knew before your pregnancy

Is there something you wish you knew or someone told you before you got pregnant or that you found out during your pregnancy that you were surprised was never mentioned? I’ve felt like I’ve had to find out so much on my own. There’s so many unspoken things about pregnancy sometimes it feel so alone. For me, I didn’t realize how challenging and exhausting first trimester is. I was expecting that for the third and fourth because that’s what you hear most about. I felt worthless and so lazy then found out how common that actually is and I felt sad like I could have been better mentally prepared.