I am 5 weeks prgnt. i've had lower back discomfort for a wk and pressure pinching only on my lwr rght abdomen towards bikini line. should i be concerned?

Probably ligaments: In the absence of any bleeding, your symptoms are most commonly associated with ligament stretching. As your uterus begins to grow, the supportive, surrounding ligaments that are attached the uterus stretch and can cause discomfort. If you symptoms worsen, you begin to bleed, or have anything else that develops that is concerning, call your OB immediately.