normal for baby to have a weird movement pattern?

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So I noticed that my baby has his active days and has his lazy days. I find it odd that his lazy days where there isn't much activity are usually near or on the days that I change over to the next week of my pregnancy and days where he's super active seem to fall a few days before my week changes. Does anyone know if this has anything to do with the growth of the baby? Like the times where he's not as active are when he's having a growth spurt and sleeping a lot or something and is this somehow correlated with the development by each week? Sorry if this is a stupid question I just notice that this is how my baby operates and I sometimes get concerned when I have days where I feel him move none stop and others where I feel him very little I figure he probably just tires himself out