Eh, sakit pinggang tu memang common dalam pregnancy, terutama kalau posture tak betul or kerja banyak duduk, hormones juga relax your ligaments so everything jadi loose. Lenguh kaki pun boleh dari circulation changes atau weight distribution shifting, tapi the stabbing sensation inside tu, I'd suggest you check with your doctor just to be sure everything's progressing well, especially since you're first-time mom, better safe than sorry, kan?