How often should I feed my pregnant guinea pig her fruits and veggies, and how much each time?

I got her from the pet store about 4 weeks fa now and shes just about doubled in size since then. She is pair-shaped and I'm almost positive she is pregnant and not just over weight. I feed her unlimited anounts of timothy and pellets, and have been giving her fresh veggies twice a giorno until recently which it is now 3 times a day. She does not want to stop eating her veggies and fruit. So my domanda is how often do I give a pregnant guinea pig fresh veggies and when I do, how much do I give her.
Her veggies consist of carrots, baby spinich, and turnup greens right now.
Thanks!!