Boob tenderness

Brittany

So I lost 30lbs back in August. 3 weeks ago I noticed I gained a pound (I had not gained any weight since October when I finished) I also got into a relationship 3 weeks ago. Yesterday I noticed I gained 5 pounds in those 3 weeks. When my period started two weeks ago I had tender breasts, and they are still semi-tender (not normal) and they got a little bigger. Could it be just due to weight gain? 😖