As spade said they are symptoms of af and pregnancy..best of luck to you..
They are symptoms of both.....
I've read that fuller bb's are b/c of progesterone levels on the rise (which happens in 2nd part of cycle).
i use progesterone cream and two days after beginning (i start on CD 14) i notice fuller/heavier bbs...I however am low on progesterone which is why i take it the 2nd half of my cycle. If this is somethign that you don't normally experience, it could be a sign of preg....
What CD are you on? i imagine that might make a difference in the answer as well! :)