Malapit na talaga mama! Based sa ultrasound mo, you're at 35 weeks and 2 days na, so roughly 4-5 weeks pa lang before your due date, super close na! Those sharp pains reaching your lower back ay normal na Braxton Hicks or ligament stretching, pero since you're nearing the end, best to mention it sa doctor mo sa follow-up on the 18th just to be safe kasi baka may timing pattern na na-miss mo. A few of us mums felt the same thing before labor, pero hindi lahat yan sign agad, basta monitor mo lang if they get regular or more intense, then you know it's time na talaga!