Hi, I mated my St Bernard back on 21st March and again 23rd March. She was scanned Monday (so day 26 from first mating) however the mobile scanner and his machine (which looked old) couldn't see anything. Couple of points. She hasn't changed much other than being affectionate towards me(it's normally my husband) The scanner doesn't usually do large/Giant breeds and seemed to be scanning more near her bottom end and no where by her ribs. Could the scan have been too early? Do Saints carry up high? My girl is a maiden. I've bred before but largest breed was Dalmatians and about 7 years ago now so I've forgotten how far gone she was before her scan. Any tips of what to look for or best times to scan?