Being aware of the possibility of becoming pregnant shortly after childbirth before the resumption of the menstrual period is often overlooked but remains a significant contributor to unintended pregnancies and may lead to maternal and neonatal comorbidities. Exploring the extent of awareness and associated factors could help tailor more interventions toward reducing the rates of short-interval unplanned pregnancies. This study explores the extent to which Ghanaian women are aware of the possibility of becoming pregnant shortly after childbirth before the resumption of the menstrual period and its associated factors. A cross-sectional study was conducted using the 2017 Ghana Maternal Health Survey. The women participants were sampled using a two-stage cluster sampling design. We analyzed the 2017 Ghana Maternal Health Survey data of 8815 women who had given birth and received both antenatal care and postnatal checks after delivery in health facilities (private and public) and responded to questions on being aware of short interpregnancy intervals. A multivariable survey logistic regression was used for the analysis. Of the 8815 women, approximately 62% of women who received both antenatal care and postnatal examinations before discharge reported being aware of short interpregnancy intervals. Postnatal examination before discharge but not antenatal care was associated with a higher awareness of short interpregnancy intervals. Women who received a postnatal examination were more aware of short interpregnancy intervals than their counterparts (adjusted odds ratio = 1.29, 95% confidence interval: 1.03-1.61). Also, awareness of short interpregnancy intervals increased with age, education, knowledge of the fertile period, contraceptive use, and delivery via cesarean section. Over a decade following the initiation of Ghana's free maternal health policy, there remains a significant gap in the awareness of short interpregnancy intervals, even among women who received both antenatal pregnancy care and postnatal examinations before discharge. The unawareness of the short interpregnancy interval observed in approximately 38% of women raises concerns about the effectiveness of counseling or education provided during antenatal care and immediate post-partum care regarding birth spacing, contraceptive use, the timing of resumption of sexual activity, and the extent to which women adhere to such guidance.