Or HaChaim on Genesis 30:22/אור החיים על בראשית ל׳:כ״ב

1 ויזכר אלוקים את רחל, G'd remembered Rachel, etc. We hear from this verse that although Rachel's plight was on G'd's mind, she also needed to pray in order to conceive and give birth. This is why the Torah added: "G'd heard."

2This verse also informs us that G'd remembers His pious ones even before they cry out to Him. This is why the Torah first mentions the fact that G'd remembered Rachel.