Is it normal to sometimes not want to hang out with your girl after dating for half a year?

r/

I (M27) have been dating this girl (F27) for about half a year now and it’s going great. This is my first happy long-term relationship so I’m not sure how things usually go with these things. Everything is going great, we get along great, we’re attracted to eachother and we care for eachother.

I love spending time with her but I’ve been noticing that there are times when she’ll ask me what I have planned for the weekend and in my mind I’m just thinking how I wanna stay at home alone, watch a movie, maybe play some games, cook etc.
Of course, I’ll change my plans so that we can hang out but the thoughts of wanting to be alone every now and then keep popping up in my mind.

Is this normal after dating someone for a long time or are these signs that I might not love her as much as I think I do?

TL DR: I’ve been dating a girl for 6+ months, we love eachother but sometimes I don’t feel like hanging out with her and it makes me doubt my feelings for her.