<s>[INST] Hi, I am going to do IVF treatment next month. So they gave me Duoluton tablets for 21days. Now i got spotting (5 days before) and i didn t get Blood flow . Some times it will happen for me..So now can i take this tablet on 5th day or i have to wait till the blood flow ?? but from 5th day i have to take the tablet. Thanks [/INST] Hi Welcome to HealthcareMagic I think you should wait for your actual period with good flow. Count the 1st day with flow as day 1 and then start taking tablet from 5th day for 21 days. It would be better if u clarify with your treating doctor also. all the best. </s>