Hi and welcome to MM Sid
I'm afraid many women get erratic bleeding when using Utrogestan. Though it is bio identical and therefore often deemed preferable to other progesterone types, it can give these issues with erratic bleeding.
Have you tried using it vaginally? This will often minimise side effects and delivers the progesterone more directly to where it is needed, so could work more efficiently and control your cycle better. I wouldn't start Utrogestan earlier in you cycle. You could switch to Provera that is a bit more powerful, so better at controlling things, or have a Mirena fitted as this would probably result in no bleeding at all after a few months.
I would try using Utrogestan vaginally first (just push the capsules up inside the vagina, as high as you can, before bed) - for days 15-26 and see if that helps.
I did find that my bleeds often started before the end of any progesterone phase so it's nothing to worry about. The important thing is to have a good bleed each month to protect the womb lining. DG x