It is not necessarily that the chest will swell before menstruation every time. If there is the possibility of pregnancy, it is more accurate to see if there is ovulation (leucorrhea) this month. I didn't ovulate because of pregnancy. Normally, this is the case, but some people are not. But most people will). If you are really worried, you should have a urine test (hCG), because the pregnancy test stick can't be found yet.