My boyfriend doesn't want to meet? Am I overthinking?

My boyfriend and I normally meet on Tuesdays and sometimes Fridays and maybe the weekend if we're lucky but this week we can't meet on any day apart from maybe the weekend.
I asked him why we can't meet on Tuesday and he said it's because it all depends on the bus time and train times.

He studies IB so hes quite busy but never has this been an issue before so now I keep worrying there's some ulterior reason even though things have been really good between us recently.
It could just be my anxiety causing me to panic but it's just weird how we normally meet on Tuesdays and now he doesnt want to because of the trains or something?

It could be because trains might cost extra too but i dont really know and I dont want to panic and be paranoid.