is it safe while expecting miscarriage

I've been spotting for a week and I am 5w6d. I had no first scan today they couldn't see heartbeat and said everything was too small to make any judgement. fast forward to tonight, I am having more dark brown/red blood. still not enough to soak a panty liners or pad. but the amount is getting more.

I am literally booked to fly out for 4 days. and my flight is at 6am so in 8hours. I'm not sure if it is okay to travel whilst expecting a miscarriage. although the medical judgement on miscarriage is hanging in the air until further scan in two weeks time, I feel given the change in the amount of spotting and change in colour that I am going to miscarry. I'm obviously heartbroken but not sure what to do with the holiday. any advice from people who had similar experience?

update: I took a digital pregnancy test and the hcg has now dropped as it shows me 2-3 weeks instead of 3+. I've decided not to go as I didn't want to miscarry during my flight or in a foreign country. I'm heading to the doctors in the morning.