Is masturbating okay?

I have read different answers to this question. I am currently 5weeks and 1 day and this my first pregnancy so I’m a little paranoid. My doc said sex is okay, but since we have a couple weeks until my first ultrasound I might wanna reframe only because intercourse can cause spotting which is scary and confusing. I told my fiancé and we haven’t had sex since , but I was in the mood a little bit ago so I decided to just rub it out, no penetration. I seen different people say it can cause bleeding and possible MC ! Is this true ? Did I make a mistake?