She could be still storing sperm prior to ovulation. Watch out for her behaviour. Ovulation can be noted by an increase in volume just behind the stomach that seems to spread out a few days later.
Take note when you see that. When you think the volume is at it´s peak before spreading, keep that day as the ovulation day.
After 15 to 40 days you should se a shed (post ovulatory shed) that will confirm pregnancy. This is the only shed that happens during all pregnancy.
Provide a basking site 24/7 from now to the day she gives birth. It is common that females will spend 90% of the pergnancy time basking.
Taking or refusing food doesn´t mean that much.

All these signs will help you knowing.