Overthinking??

Hey guys I would like some help. I'm sorry that this is so long, but I didn't know how else to say it.. This is probably really stupid, and I'm probably just over thinking and being insecure (I am on my period so I'm like 100000 times more emotional about little stupid things). But okay so here it goes. My boyfriend and I have been together for 1 year and 2 months as of Monday. He works night shifts and I'm an hour away at school. I make the drive every weekend to spend time with him and to work. He always texts me when he gets to work safe, because he knows I worry. Usually before he leaves, I'll say "drive safe to work. I love you." For the past two days, all he responded with was "I will." Usually he says "I love you too." And then on his first break, he'll text me and we will talk for the 15 minutes he gets. At the end, he usually says something along the lines of "I gtg baby I love you." Well, again for the past two days, I haven't even gotten a "I gtg", he just stops answering me. But then when he takes lunch we FaceTime and before we hang up we say it and then we say it again before he goes back into work. Then he'll text me when he gets home (even though I'm sleeping) so I know he got home okay and he will say it then. I just don't know if something is up that he doesn't say it when he leaves for work and when he gets off break or if I'm overthinking.. Any advice would be helpful 😩