Hi! I am very sorry for your pickle!
Firstly, could you please give us more information so we can get a picture about what kind of situation your are dealing with in order to establish a time line. How many girls have you got? How old are they? What kind of place have you got them from?
Could you also please add your country, state or (for the UK) your county to your details so we can take the particulars of your part of the globe into account and always give you the appropriate advice and recommendations straight away. Click on your username on the top bar, then got to personal details/location. Thanks!
You may want to use this website here to check the gender of your piggies. The pregnancy must have most likely happened before you got them, but you want to make sure.
http://www.cavyspirit.com/sexing.htm
When a handling a potentially highly pregnant sow, please be careful to not put any pressure on the belly at any time; ideally you lift her in a conveyance of some sort.
https://www.theguineapigforum.co.uk/videos/ (see pick-up video)
Please read our guides at the top of this section carefully; they will hopefully answer most of the practical questions you may have, but you are most welcome to ask any remaining ones or any that have arisen when reading the information.
https://www.theguineapigforum.co.uk/threads/pregnancy-guide.109375/
It is vital that you do not overfeed a pregnant sow during the second half of her pregnancy, especially in terms of pellets. Please limit the amount of pellets to a maximum of 40g for your pregnant sow if she is around 4 months old, less if she is older. By this, you can make sure that the babies will be an ideal birthing size and not cause any problems. This is the biggest risk factor that you can influence.
You will find more particulars about what a pregnant sow needs:
https://www.theguineapigforum.co.uk/threads/pregnancy-diet.109377/
We cannot confirm a pregnancy over the internet, but we can help you get as clear a picture as possible and support you in the next few weeks.
Please keep all your questions and updates to this thread, so we can always refer back to your specific situation and the time line.