When it comes to condoms, two is NOT better than one. Two condoms can create more friction, which increases the chances the condom(s) will break. If you want to be very safe, use a condom and another effective contraceptive method.
Try a different method: implant.
References:
- World Health Organization Department of Reproductive Health and Research and Johns Hopkins Bloomberg School of Public Health Center for Communication Programs (2018) Family Planning: A Global Handbook for Providers. Baltimore and Geneva. Retrieved from https://apps.who.int/iris/bitstream/handle/10665/260156/9780999203705-eng.pdf?sequence=1