Is it in my head?

So my wife and I have been married for almost 2 years and I'm noticing some things that are making me uncomfortable due to my past relationships.
My wife never post pictures of us on social media or anything about me like she use to not to long ago but always posting pictures of herself and in the pictures she is always hiding her ring also she started to wear no underwear to work and when asked about it she claims she can't with that type of dress but she's had thses dress for some time now and she is starting to wear thongs to work.
not even a year ago I had to beg her to wear some for me but she said she hates them now she is wearing them to work and when she gets home she changes out of them. I really belive in my heart she is faithful still but the voices from my past are throwing red flags and I don't know what to think am I over reacting or under reacting?
Is it in my head?
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