Need advice

Hiiii girls..

I am 5 weeks 4 days pregnant.. I have my first appointment after competition of 7th week.. But I am traveling for work like 600 km away with train on Monday and returning back on Thursday.. I am not experiencing any morning sickness or nausea.. But suddenly today in train felt like I will lose my consciousness in some 2-3 min.. Felt like vomiting, visiting rest room, felt like empty stomach with gas although I have eaten an hr before..

so morning sickness can start any time for me? Is it really safe to travel this coming week? Or should I take excuse in work.. Need advice girls..