4th child pregnancy "UNEXPECTED "

Tara
Hey y'all...
My boyfriend and I have been together since I was 17 and he was 18 . We already have had 3-kids together 
Boy - 15
Girl- 14
Boy - 10
And found out I was pregnant 2-weeks ago . He definitely was not happy even though plenty of times he always says he wanted more kids..etc ...HE basically has treated me like crap and almost forcing me to have a abortion and I'm like 15 weeks. I know it wasn't planned and life isn't perfect - but it never is and I DONT want to go thru with that . I don't know what to do or how to fix this . He's very hard to talk to ??
Any advice