FSH levels fluctuate, so that is normal.
The average number of eggs retrieved in a 30 year old undergoing IVF is probably 12-13, but quality, not quantity, is what counts. Most of the time it is better to be 30 years old with 6-8 eggs than it is to be 38 years old with 15 eggs, so try not to be too crushed. It only takes one good egg! At age 30, even with fewer than average eggs and two prior IVF cycles, your chances remain very good.