day 12 of down regs - why no period?

I starting to wonder if it is ever going to come? It is day 12 of injecting burselin - and I have six more days before I am due to go for a scan and start stims. Is it possible to start if I don't get my period? It has felt like it is coming for days but alas no. Funny hey - every month I'd kill to get no period - and it ALWAYS turns up - right on time. Has burselin made anybody elses period seriously late?

The burselin has been fine - no moody grumpy cow in my house - or no more so than usual. A bit hot at night time but no night sweats as it were. Easy peasy.