Has weight training caused me to lose weight or are my clothes just stretched?

I bought some clothes that fit right at the end of December.. Since then I've been doing weight training and now those clothes are fitting looser.. Are they stretching or am I losing weight? I don't keep track of my numbers or inches because I would become obsessed (would turn into an eating disorder) just wondering what your opinion is..
Has weight training caused me to lose weight or are my clothes just stretched?
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