Doctor, do vaginal infection causes pain during intercourse? it lead to miscarriage? any problem for next pregnancy?

Yes, no: Yes, vaginal infections can lead to pain with sex. Miscarriages are usually due to unknown factors. Average vaginal infections are unlikely to cause a miscarriage. Next pregnancy will depend on the type of infection. If it is gonorrhea or chlamydia, you could have an increased risk of ectopic pregnancy next time. You should see a doctor and have a pelvic exam.