It's been four months that my husband and i are trying to have a baby, what's the normal time frame before seeking for medical help?

Usually 1 year: 87% of couples will be pregnant within 1 year of not using contraception. This percentage increases to 95% after 18 months.

1-2 yrs: If your question is about seeking an evaluation for infertility , most would not recommend the time & expense until you've tried for 1-2 yrs. This would include a workup of both you and your partner at a fertility center.A visit to your regular obgyn source would be at whatever point you felt it worthwhile.