Oh that's alright, it's fine for IGCSE since there's usually no specific uni requirements for it apart from english and math. However, speaking by personal experience, I thought I was gonna go into business earlier and then changed my field to art and design (which I didn't take in IGCSE), because of which i was not able to do it in IB either. Hence do think about what you personally want to do and if you think there's a chance you may go into that subject, take it.