I'm not sure how much you've been recommended to take, but like @leyshoja/JM said..be able to tell your GP the dosage and for how long you'll need to be on it. The standard immune protocol is 12 weeks if you get a BFP but it could be longer if you've got known immune issues.
Also, @Chiefsgirl recommended some Vit's/supplements you should take while you're on the Prednisone to replace what it might potentially leech from your body I think?? Can't remember them offhand but am sure Chiefs will chime in with them again
P.S...The Pred made me feel like a scattered mess and gave me insomnia for a while until I got used to the side effects (so take them first thing in the morning!!). I also put on weight (always did when Cycling regardless) and "Moon Face" as well It can cause changes in the shape or location of body fat (especially in your arms, legs, face, neck, breasts, and waist). All worth it of course, but still frucking sucked at the time!!!