Comparison of Follitropin Delta and Follitropin Alfa in Combination With Menotropin

The goal of this retrospective study is to compare the effectiveness and cost-effectiveness of two mixed ovarian stimulation protocols in women undergoing in vitro fertilization (IVF). The main questions it aims to answer are: * Does the combination of follitropin delta + HP-hMG result in a higher number of utilizable blastocysts per treatment cycle compared to follitropin alfa + HP-hMG? * Does the follitropin delta based mixed protocol reduce total gonadotropin dose and cost per usable blastocyst while maintaining or improving pregnancy outcomes? Researchers will compare follitropin alfa (Gonal-F®) + HP-hMG (Menopur®) with follitropin delta (Rekovelle®) + HP-hMG (Menopur®) to determine which protocol improves ovarian response, embryology outcomes, pregnancy rates, and overall treatment cost-efficiency.