Boobs are smaller??!

I am 8 weeks 6 days today. The first couple weeks my boobs grew like a lot a lot. Yesterday I noticed they seemed to be getting smaller. And today they seem like they are the same size as they were before I got pregnant! They are still sore and I’m still nauseous and experiencing other symptoms... I was just under the impression that they would stay big or keep getting bigger. First pregnancy and I don’t know what to expect. Has anyone experienced this? Is this normal or should I be concerned...?