Hysteroscopy due this Thursday - will it go ahead if I've started bleeding?

Hi 

No periods for over a year then tried HRT in Feb 25 swapped to continuous HRT conti patches in May 25 then a light bleed in July. So the Doctor starts a referral.  Blood tests just showed low B12( asked to take vitamins ) and  slightly elevated protein serum the CA125 is all good.   Had internal scan it showed borderline lining so then booked in for a hysteroscopy  which is this Thursday 

Saturday I started what looks and feels like a full period and today Tuesday I'm still bleeding but not as heavy.  I really want to get the hysteroscopy over and done with but read that if your bleeding heavily then you should rearrange.  I haven't rescheduled yet as I'm hoping tomorrow day five will be lighter?  Has anyone had a hysteroscopy when bleeding or did they instantly reschedule.  What would you class as heavy bleeding?