Boyfriend moving back to his grandparents

Hi there myself and my boyfriend have been together for 7-8 month now and everything has been amazing we get along really well and he makes me a better person and so much happier but recently we have came to notice there is a chance I may be pregnant and as soon as I told him this a day or two later he went and stayed at his g.parents he came home last night and then told me he’s going home again his excuse is he isnt well and feeling home sick I’m in my house all alone not knowing if something is going on or if it’s genuinely because he isn’t well but I think he’s pushing me away now and it actually terrifies me please give advice