I remember in 2003 when I got two female guinea pigs. The one day I came home from work and one of them had given birth to 3 babies - I never knew she was pregnant as she was pregnant from the shop as they were definitely both female. It was a nice surprise though, they were all gorgeous, so tiny, about 2-3 inches long when newborn. So cute. If they do have babies you will love them! We kept one and had to take two back to the shop because we did not have enough space for 5 of them. They all lived long happy lives till 2008 when they were all over 5 years old and died of old age.
Guinea pigs are lovely and make great pets.
I hope your two little piggies get along, could they just be playing? Getting to know each other? Or as garner says they could be getting to know each other a lot, lol.
Good luck with the little cuties! x