Is it normal for your period to completely disappear for a few months then come back lighter and way shorter than it was before being Vegan?

Since going fully plant based my period has disappeared for 2 whole cycles. My doctor said it’s normal response as it can be traumatic to the body to make a drastic change suddenly.. well now I recently got it but it seems to be ending on day 4. My cycles would be 6 days long before making this lifestyle change. Now it seems to only be at 4 days and it has been very light compared to how it used to be. Also little to no cramps. But heavy mood changes, not out of the ordinary for me.

I’m not really complaining but just a little worried that something could be off?

Anyone else have an experience like this ?

I’m not on birth control. The mirena ruined my skin and my hormones so I’ve been bc free for 2 years now.