Watery discharge during 28 weeks pregnant

I get white watery discharge from Vagina when getting up from bed, sleeping, travelling. Is it normal or should I check up with Doctor? Last time when visited Doctor on same problem, she told me it could be coz of vaginal infection and gave wash, oinment. But now the no.of times of discharge is heavy. I am worried. How to differentiate between amniotic fluid and vaginal discharge?#1stimemom #firstbaby #pleasehelp #advicepls #pregnancy