St James appointment

Hi,

I attended an appointment last week for a mammogram at St James hospital Dublin. I was told the hospital would be in contact when as to when ill have to return for an ultrasound. I thought the two would be carried out on the same day? My question is , has anyone had any experience of this in James hospital? If so how long does it take usually to hear back in relation to the follow-up appointment? I have a big lump for over a month now, which came out of nowhere, it isn't mobile and feels attached, Its just under my areola and I'm stressing about it a lot. I'm in my mid forties and I've just had my first baby a few months back, although I'm not breast feeding or using a pump.
Thanks in advance.