Cramping on lower abdomen on left side and lower back pain as well, this is all 6 days after conception. could these symptoms relate to pregnancy?

Yes, but: It is a little early to be having pregnancy symptoms. Sometimes women have lower abdominal pain from an ectopic pregnancy, but not this soon after conception, usually. Unrelated to pregnancy, an ovarian cyst or a urinary tract infection could both cause these symptoms. Best to see a doctor and get checked out if the symptoms are really bothering you.