Hi Georgi, im so sorry for your loss hun, its a really hard thing to deal with but you have lots of support here. Please take your time to grieve the loss of your angel.
I was straight back into a normal cycle from the day my little one passed, but my cycles have been alittle off since. AF seems to come two days early all the time and stuff like that. It helps to use OPK's to see if your ovulating, because that can sometimes be delayed.

best of luck and i hope you stay is short in here
hugs
treelo