Welcome! I had my first at 17 and had the same reactions you have had so far. I didn't tell my dad, my mum did thankfully. My mum took it really badly for a few weeks but slowly started to come around when she realised I was definitely continuing with the pregnancy. My dad took it very badly and did not talk to me until I was in my third trimester but now he absolutely adores my kids and as soon as my eldest was born he was ecstatic. It is really hard in the beginning though but usually it does get easier as family get used to the fact that their baby is having a baby because it is understandably a huge and shocking thing for them too and they need their own time to process it, just like you. Anyway, I told my dad in person with my second and got a better reaction (though probably because it was the second time!) where he just told me it was my life and gave me a hug. I hope things go well with telling your dad.
I'm now 24 and my eldest is almost 7 and I'm happy to answer any questions if you have any.
