In your situation I’d suggest you send the radiologist a message 2 days before the upcoming scans reminding them that your original mammogram was inconclusive, that the type of cancer cells you had were not clear on that scan.
And then at the beginning of the mammogram/ultrasound tell the technician the same thing.

It doesn’t hurt to politely alert them that extra attention may be needed in your case. The mammogram technician at my follow up scan thanked me for the info and told me I should always share anything that might help them - at the beginning of the scan!

My original scans were also inconclusive (they wanted me to come back in 6 months). My intermediate grade DCIS did not have many/any calcifications which is what a mammogram is good at detecting. A couple of months before my year and a half mammogram I received notice through the message app that a MRI was added. Which actually scared me because I thought they found something that was missed.
I messaged the radiologist and she said she remembered our conversation about no calcifications and decided to add the MRI.
Depending on the facility, and your insurance, the follow up protocol may be a mammogram. They may need to justify a MRI to get it paid for, and an ultrasound may trigger that. So even if you don’t have a MRI scheduled now, it may be part of what’s next.