7dpo and having bad stretching aching pains in lower back and right side of pelvis. Is this normal? Is this a sign of pregnancy? If yes will b my 4th

A little early. 7 days post ovulation is a little early to suspect that any symptoms you are having are the result of pregnancy. One way to tell is to check a home pregnancy test. If negative then this implies that the hormone levels are too low for detection. If there are no detectable hormonal changes then the symptoms are not caused by that. A better time to take a test is if you miss your next period.