Boyfriend acting different

So my boyfriend has been acting pretty distant the past two days. I keep asking him if everything is okay and he says that it is. We just started to plan a vacation together. He said that we wouldn’t be doing that if something was wrong and keeps asking me what he needs to do to show there is nothing wrong but he hasn’t held me in our sleep the past couple of days and he just seems off. We just spent last weekend with his parents for his birthday who make him feel bad. We are supposed to travel tomorrow to go to his uncles. I just don’t want to lose him. What should I do? Should I just leave it for now? Do you think it’s all in my head? I just got my period 16 days early so maybe it’s just the hormones?