Lumpy breasts

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Does anyone else have lumpy breasts? Or did you have lumpy breasts whilst you was pregnant? Currently 21 weeks and breasts are quite lumpy! Never noticed this before...

I did go to see the GP and she told me it was normal and it feels fine but to come back in 4 weeks? If it feels fine and normal then why does she want me to go back? I’m worried now! I’m only 20!