A throbbing pain in the pubic area in the 9th week of pregnancy may be caused by an enlarged uterus, fetal pressure on the nerves and pre-miscarriage. 1. Enlarged uterus: As the fetus in the abdomen grows, the uterus needs to expand. During the process of uterine enlargement, the uterus may experience occasional cramps, resulting in a throbbing pain in the pubic area. 2. Fetus pressing on nerves: The gradually growing fetus in the uterus may press on the nerves distributed around the uterus, such as bladder nerves, colon nerves and sciatic nerves, etc., which will trigger a throbbing pain in the pubic area when the compressed nerves spasm. 3. Pre-eclampsia: If a pregnant woman in her 9th week of pregnancy has frequent twitching pains in the pubic area, accompanied by vaginal redness, it is likely that pre-eclampsia is present. If you have a twitching pain in the pubic area at 9 weeks of pregnancy, you should go to the hospital in time to check the cause, so as to avoid serious consequences.