Need advice from people on T

TW for mentions of menstruation/blood

Hey everyone so I've already messaged my doctor but she hasn't gotten back to me yet.

I missed my shot day by about 20 days. Got it on monday (17th) and now four days later I've noticed a little blood on the toilet paper. It wasn't a lot but was more than spotting. Is this normal?

I haven't gotten my period since a month on T (3 years ago)

Thanks in advance!!

Edit - My doctor answered yall. Thanks for everyone who took time to reply :)