Due to hormonal changes and also check
whether you have pre menstrual syndrome
where the chest congestion and lump or knot feel in the breast is quite common. It is called premenstrual syndrome, it is quite common to feel that sensation, if you are pregnant
you may not sever back pain
. If the back and the leg pain
is severe in general it is due to the pre menstrual syndrome, since the periods are delayed by 3 days the intense pain
is quite natural do not worry.