Guest 37262-
The swelling of the breast is due to adding an un-natural hormone to your body. It is an increase to the existing progesterone and estrogen naturally occuring in your body. We all have progesterone and estrogen receptors in our breasts-that is often why many women's breasts grow when taking hormones. Its not really a healthy thing although many women think its great, I think its actually what's causing breast cancer as there are so many women and the #'s growing. My own personal experience is that it doesn't go away until you go off of all hormones.
On the gaining weight, it sounds like you are one of the unusual women to gain/rather than lose weight on Yasmin. Watch that, discuss with your OBGYN and pay special attention to every other symptom that may develop.
Yasmin is really not a good birth control pill. There are so many women on this site and the new one in the UK who have suffered horribly with serious symptoms. so my recommendation would be to get off it and practice natural protection/non-hormonal methods.