Okay lang ba i-retract ang application kahit nakapirma na sa contract? Fresh grad dilemma

Hi everyone, fresh grad here and gusto ko lang sana humingi ng advice.

Ilang months na rin akong naghahanap ng work bago ako nakakuha ng offer kay Company A (agency). Nakapirma na ako ng contract and currently inaasikaso ko na yung onboarding requirements and medical. Nagkaroon lang ng konting complication sa medical ko kaya medyo nadelay yung process, pero mukhang mareresolve naman soon. The role here is Excel/Data Analyst, and the contract is for a 6-month project.

Recently, nagparamdam ulit si Company B (bank) regarding my application. They’re offering a Tech/Training program with 6 months training, then 2 years of work after the training. Compensation-wise, mas maganda rin siya compared to Company A. Also, since it’s in a bank, I feel like it aligns more with my long-term goal which is to eventually enter the fintech space.

Now I’m a bit conflicted. Since nakapirma na ako ng contract with Company A, pero hindi pa naman ako officially nagsisimula mag work, okay lang ba na i-retract ko yung application if I decide to pursue Company B?

May possible bang legal or professional issues dito? Ayoko rin sana masunog bridges, especially since fresh grad pa lang ako, but at the same time gusto ko rin piliin yung mas aligned sa long-term career path ko.

Would appreciate any advice, especially if may naka-experience na ng similar situation. Thanks!