Ovulex has Vitex in it. Vitex is also known as Chastetree or Chasteberry. it is a natural supplement that balances hormones. Ovulex includes Vitex, but also several other ingredients. You could probably take them together, but it wouldn't make much sense. I'm not sure about clomid, because it is an actual drug you would want to talk to your OBGYN. Ovulex does not have the ingredients you need from a prenatal, so you would need to take that separately.
Personally I chose to just take Vitex on its own and it has balanced out my cycle really well.