Hi, hope you can help, I'm 5 days late on my period and keep getting pains in my pelvis stomach and lower back, cramp like feeling in my legs feeling?

See doc immediately. This could be very serious. Take a pregnancy test and if it is positive go the the Emergency Department or see a doctor immediately. This could be an ectopic pregnancy (pregnancy in the tubes) and that can be very dangerous. If pregnancy test is positive be seen today.