No don't take dashmoolarishta during pregnancy!
This medicine mainly acts on apan vayu which is responsible for proper onset of periods,stool,urine and ease in delivery of baby!
As we don't want any contraction of uterus here ...so stop taking it!
There are other medicines for masanumasik (month wise treatment in pregnancy)which you can start for proper development of baby as well as well being of mother during pregnancy!
Consult for detail diet plan + masanumasik medicines for 9 months !!!
Next Steps
take as much rest as you can ....relax and meditate...you can do light yoga!