Generally speaking, a change in bail can be argued for (either increased or decreased) when there is a change in circumstances that affects the release status, for example, if new information arises that the judge did not consider at the time of the original setting.
It is unlikely that that The Chester County Court of Common Pleas will change your bail at arraignment. They can revoke the bail if you get into more trouble. But otherwise they should leave it where it is currently set.
This information does not create an attorney /client relationship and should not be use or relied upon to make any decision in your case. Only consultation with your own attorney can provide you with the advice you need for your case.
The answer to your question is yes, it's possible, though it's very rare. Generally, there would have to be some new development in your case for the DA to all of a sudden request that bail be revoked or raised. They will often do this if you've violated a bail condition or if you've had a new arrest.
Nothing in this question or answer shall let any person or use (including the person who asked the question) the impression that Mr. Benari is their attorney or that the attorney-client relationship has been created. All answers given by Mr. Benari are made as if they were hypotheticals, and no true legal advice can be given unless Mr. Benari is retained and is provided with a complete set of all the facts involved.