With your blood and stool reports all coming back normal, this looks more like your gut recovering unevenly after back-to-back antibiotic courses rather than a fresh infection. Loose motions flaring up again partway through treatment is common in this situation, especially with travel added on top.
Next Steps
Keep up fluids and ORS through the day, and stick to simple, low-fat meals until this settles. Please mention this to your treating doctor, since the plan may need adjusting rather than you changing it yourself.
Health Tips
If you develop a high fever, blood in the stool, or can't keep fluids down before you travel, please see a doctor in person wherever you are rather than waiting until you're back home.