Am I just overacting ?

Or is my fiancé hiding something. Well I'm 7 months pregnant and he's been going to the gym recently after work. I haven't thought much of i until today. I'm getting off work early so I called him and said by the time I get to the gym where he's at, it will be 5:30 and we can go eat or something. We live 30 minutes away to town and there's no food places or anything to eat that's why I said lets meet up. Anyways he kinda stutterer and kept saying well I'm just getting here i might not be done. I said il wait. And he said again I might not be done. Just call me. We hung up and I texted him il call him around 5, and he texted back saying well idk yet that he's gonna turn his phone off so his battery doesn't die. I texted again and no reply. Called back and his phone is off already 😒 im like confused now, is he telling me not to go? Should I just go home. I'm really upset. I kinda realized he always goes MIA recently when he started going to the gym. The thing is his friend supposedly takes him from work to the gym and then after back to his car. So should I go stalker status and wait at the gym for them to come out? Lol