IVF cycle timing question – embryo transfer moved earlier than expected (D5 transfer)

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Hello,

I’m currently going through an IVF cycle and I’m looking for outside perspectives because I’m a bit confused about how my cycle timing is being managed.

To summarize briefly:

Ovitrelle trigger done on July 5th at 8:00 PM

Blood test that morning: LH 23, progesterone 2.2, estradiol 665

Ultrasound: leading follicle 18.4 mm, no clear ovulation yet

Based on my understanding, my day 5 embryo transfer was initially scheduled around July 12th.

However, the clinic (IVI Madrid) informed me that the transfer could actually be done on Friday July 10th.

From what I understand, this change is mainly related to their organization (weekend scheduling), but it no longer matches what I thought the typical timing should be for a day 5 transfer after trigger.

So I’m wondering:

Is this kind of timing shift normal in some protocols?

Is it common for clinics to adjust transfer dates for logistical reasons?

Or could this potentially affect the synchronization of the endometrium?

Thank you in advance for any insights.