Mommy, yan talaga ang common sa 34 weeks, pero since you're having trouble walking at feeling stiff, mas okay na i-check mo with your OB para sure lang, sometimes it's just Braxton Hicks or the baby's position, pero better safe than sorry especially pag limited na ang movement mo. A few of us had the same worries around that time, and turned out normal lang, pero ang peace of mind from your doctor is really worth it. Take it easy muna, rest as much as you can, at let me know what your doc says, ha!