Feeling that need to go to toilet but nothing comes

NB • 🤰💅🏼👨‍👩‍👧‍👦

Since today afternoon (night now in Australia) feeling that i need to go to toilet but when i go nothing comes. I had that feeling with my first delivery but that was bit different.

Apart from that nothing. Just contractions which i am getting since 27 weeks. Now 35+5.

Anyone else experienced this or have any idea why it could be like that