Yes, you can become pregnant again within one month after giving birth, although it is less likely if you are exclusively breastfeeding. Ovulation can resume as early as two to three weeks postpartum, even before your first menstrual period returns. This means pregnancy is possible during this time, particularly if you have unprotected intercourse.
Breastfeeding does provide some contraceptive protection through lactational amenorrhea—the absence of periods due to breastfeeding hormones. However, this protection is not reliable as a sole method of contraception. It works best when exclusively breastfeeding frequently (at least every few hours), day and night, and has a failure rate of around 2% with perfect use and higher with typical use.
If you are not breastfeeding or are combining formula with breastfeeding, the risk of pregnancy is higher because ovulation typically resumes sooner. Your fertility can return quite quickly, sometimes within 25-28 days after delivery.
It's important to discuss contraception options with your healthcare provider if you wish to prevent pregnancy. Many contraceptive methods are safe to use postpartum and while breastfeeding, including barrier methods (condoms, diaphragm), hormonal options (some birth control pills, patches, and injections), and long-acting reversible contraceptives like IUDs or implants. Your timing depends on your individual health status and whether you're breastfeeding.