Sayang, any bleeding during pregnancy kena check ASAP, don't wait 5 days okay. Go to your clinic or hospital tomorrow pagi, jangan delay. It could be nothing serious, tapi better safe than sorry when it comes to baby. Trekking activity tu mungkin jadi trigger, jadi doctor perlu check if baby is okay. Jangan risau, tapi jangan tunggu-tunggu, go tomorrow, yes?