Trying to figure out when my guinea pig will give birth

[Bmesker2004]

Hello my name is briley I have been a owner of guinea pigs for I think two maybe four years now right now I have a guinea pig that's pregnant for the first time she is on record 68 days pregnant she mated August 12th now her pelvis is about besides of my index finger the tip of my index finger and the babies are moving but they're not moving as much and I've been noticing some signs that she may be going into labor for the past three nights she had me pretty convinced that she was going into labor the way she was acting sometimes I'll catch her in a corner laying down and she'll make these little quiet vocaling sounds and sort of jump up a little bit not like completely but while she's laying down she'll jump and make vocaling sounds with it it had me pretty convinced that she was going into labor and last night she did the same exact thing and I had her in my bed for a little bit to spend some time with her and I noticed that she was grooming herself a lot and she groomed herself so much that some parts of her body were wet and I noticed that after she calmed down for a little bit she was squinting her eyes and making some sounds and that had me pretty convinced that she was going into labor but they're still no babies I do not I don't know when she's going to give birth but I wanted to get some opinions from some people so yeah let me know what you think

[Lynx]

The best advice I have to offer is on this page:
https://www.guinealynx.info/labor.html

Fortunately, I have never had a pregnant guinea pig (pregnancies can be risky).

bpatters has some excellent advice too. Unfortunately, I can't lay my hands on it at the moment.