Hello, I'm currently 34 weeks and 4 days pregnant. At the end of week ...

Hello, I'm currently 34 weeks and 4 days pregnant. At the end of week 32, I expelled the mucus plug, and spent a couple of days in the hospital. The ultrasound showed placental maturation at stage 2 (at the beginning of week 33). On the ultrasound, the cervical length was 3.4 cm. After four days, it was 3.0 cm. (But two different doctors did the ultrasound). The KTG shows uterine tone, if it is slightly similar, then the lower abdomen pulls like during menstruation and sometimes pricks sharply, right away. Has anyone experienced this? And how long after did you give birth?