Do I have a yeast infection or something else?

around 2 weeks ago i had sex and then last week i got my period and ever since sex i had a tiny bit if irritation/itching and my discharge is sometimes a bit clumpy like this and it stains my underwear but it doesnt really smell is it s yeast infection please help!!!

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It’s difficult to say based on the photo, but according to your description - it could be yeast infection.