Fertility treatment / IVF and Glow

MissJelly
Hi. Can you please tell me what to do next week when I'm due for my period but have started fertility / IVF meds. I may get some bleeding between now and when I start injections around the 25/06, but I shouldn't get a full period due to the meds I'm on - I think is what the dr said.
​Or is the easiest way to keep pushing my period log back until either I get my period after IVF and I'm not preg or I find out I'm preg and can tick that box? 
​My question is then, how do I change it so my dates are right as it look like I'm further along on glow than I will be if I get preg in July following IVF.