I'd agree with the others that if your role has changed you should expect a compensation change. Having said that, I'd suggest talking to your manager first. Explain that you are doing more than you were originally hired for. If he agrees, you should discuss increasing your compensation. However in a startup they might just see this as "all hands on deck" pitching in. In which case I'd leave the conversation to your year-end evaluation. Depends a lot on the company culture.
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I'd agree with the others that if your role has changed you should expect a compensation change. Having said that, I'd suggest talking to your manager first. Explain that you are doing more than you were originally hired for. If he agrees, you should discuss increasing your compensation. However in a startup they might just see this as "all hands on deck" pitching in. In which case I'd leave the conversation to your year-end evaluation. Depends a lot on the company culture.