18 and pregnant and moving out

Ok so on the 14th of this month is my 18th birthday. Me and my boyfriend already have plans on me moving in with him, we have his dads and grandparents help but my parents seem like they don't want me to move in with him. Me and him both love each other and I am about 2-3 months pregnant. Neither of our parents know yet but we plan on telling them soon. I plan on moving in with him no matter what they say or think. They legally can't keep me from moving out.. any opinions or advice??? Thank you so much in advance