in my suggestion DVT has good amount of treatment so not to worry..earlier you where on acitrom which is given to dissolve thrombus clot in your vein but it is not that safe in early pregnancy so your doc adviced you daflon which is a multivitamin and a vascular tone increaser however it is safe in pregnancy..but sometimes it may cause adverse gastric symptoms like nausea or vomiting..if it takes severe form you can consult your obstretician...if sypmtoms are minimal you can take a dose of nomit..thank you