The goal of this clinical trial is to evaluate whether the direct warming method for frozen embryo transfers (FET) can improve live birth and pregnancy outcomes in women aged 18-45 undergoing IVF treatments. The main questions it aims to answer are: * Does the direct warming method achieve a similar or higher clinical success rate for FET compared to the conventional multi-step method? * Is the direct warming method more cost-effective than the conventional method? Researchers will compare the direct warming method to the conventional multi-step method to see if the former leads to better pregnancy outcomes and reduced procedural time. Participants will: * Undergo either the one-step or conventional embryo thawing procedure. * Complete standard clinical follow-ups for pregnancy, including ultrasound scans and pregnancy tests.
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Clinical Pregnancy Rate
Timeframe: 6-8 weeks post embryo transfer
Ongoing Pregnancy Rate (OPR)
Timeframe: 12 weeks post embryo transfer
Live Birth Rate (LBR)
Timeframe: At delivery, approximately 9 months post embryo transfer
Cost-Effectiveness
Timeframe: At the end of the study, approximately 4 years.