Welcome to HealthcareMagic
It would be better if you mention the name of injections. As you are on 4 th day of IVF treatment, I presume that you are getting gondatotropin injections( with or without Gnrh agonist) for ovarian stimulation
or only Gnrh agonist. Yes you are right that dosage of injection is pre decided and exact dose should be taken correctly under the skin or intra muscularly. As volume of these injection is very small these injections can be given subcutaneously ( Highly purified and recombinant) in no time. It is absolutely OK to walk and do your normal routine. You should avoid physical or mental stress
. Avoid lifting weights ( eg. Bucket filled with water ). Regarding dosage of injections you can always clarify with your treating doctor.
All the very best for the treatment.