This is false, and we know it's false because in every country with optional maternity leave, more than 50% of women take their leave. Even in the US which lacks legal requirements for employers to offer paid maternity leave, over 70% of women took maternity leave--presumably the remaining 30% is largely a subset of the 33% of women who were not offered paid maternity leave. That you know people who were pressured into foregoing their leave is anecdotal.

[0]: https://mchb.hrsa.gov/whusa11/hstat/hsrmh/downloads/pdf/233m...