What more can I do?

So about 6 weeks ago I had a “holiday fling” It ended pretty rapid and not on the best terms.

I’ve recently found out I’m pregnant, at first he wanted to keep it and be there for me and the baby and then the more we talked we both got angry said things we didn’t mean and he changed his mind and said he didn’t want it and wouldn’t be in its life regardless.

Fast forward 1 week he has text me saying I’ve made the pregnancy up I’m sick in the head etc even though I’ve offered to do tests in front of him, I’ve told him the date of my first midwife appointment I’ve offered everything and he is still not believing me.

Someone please help me I don’t know what more I can do to prove this to him... I am blocked from his phone now and have no way of contacting him.

I have no history of lying to anyone let alone someone that doesn’t even really know me.