You could also get a tracker and put it in his car, or do a "find my phone" app so you know where he is.
Private investigators are for that.
I'm just so stressed right now and on top of everything now I have to stress about this.. I'm just overwhelmed and just want him to man up and give me straight answers instead of bull**** lies. I just want proof of whatever he's actually doing so he can't come up with a lie to cover it up.
I want to find out I don't want to just pretend like nothing is wrong
You could hire a private detective to follow him. But right now you are 8 months pregnant. Do you want to find out or would you rather just keep going as things are?