Is it wrong of me to be upset?

As the title states above, Is it wrong of me to be upset? Any advice.

I found that my boyfriend has been liking pictures of online models (similar to the ones below) on instagram. Some of the pictures he liked are much more provocative in clothes/positions. There is nothing wrong with these women, they're all beautiful. And he has followed these types of accounts before we even started to date (before he asked me to be his girlfriend).

Though we haven't been together long, I kind of feel hurt when I see the his likes on the posts that were made after we started dating (after he had asked me to be his girlfriend). I don't have much thoughts on his likes from before we started dating.

(A little background: He and I have been friends for two years, but only recently started talking more in a romantic sense in the past 6 months).

Maybe asking advice is the wrong word to say... but I don't know if I have the right to feel this way because we only started dating and he's followed these models for a long time.

(I'm also right now on my period and I don't know if that's making me moodier than usual).

Example Images below:
Is it wrong of me to be upset?
Is it wrong of me to be upset?
Is it wrong of me to be upset?
Is it wrong of me to be upset?
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