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My n ame is Joan and I have been a Vet tech for 30+ years. I would love to assist you.
When the Vet took the Xray it was too early to show. Depending on the size of the litter, it can range from 67-70 days before a birth. From what you have said you have about another 30 days before there will be a birth. When a Guinea pig is pregnant they get very big and what is described as dumpy. A good diet is a must during the pregnancy.
Pregnant guinea pigs should be fed a mixed diet consisting of:
grass and/or grass hay, green leafy vegetables, small amount of vitamin C rich foods ie. citrus or kiwi fruit, a small amount of high quality commercial pellets.
It would be best for you to take the male out of the enclosure now before 50 days in. You also may ask the Vet to recheck with a sonagram as well as another Xray to be sure what is going on.
It is not unusual for a guinea pig to have problems during birth so best to know for sure that she is pregnant and have a Vet on call if needed.
This is a link on Pregnancy that may also help you: http://www.2ndchance.info/gpreprodprobs.htm