I think my husband is hiding something

My husband has lied in the past about things which had led to me having slight trust issues. This was long ago and trust was rebuilt as it wasn’t huge things, more like white lies.

Fast forward to now, I have been having this sick feeling that something’s been off or wrong or feeling of something bad happening that I’ve been voicing to him daily for almost 3 weeks now. He reassures me that he’s been completely honest with me. Yet I still have this nagging feeling that won’t go away. I trusted my husband, or so I thought. Now I feel like I’m questioning everything and nothing’s really changed besides us becoming long distance due to work. It’s temporary thankfully. I don’t know if it’s hormones because I’m 8 months pregnant or just some stuff we need to work out but I really did think I trusted him all this time. We had no issue. Until now. I don’t want to go off of nothing because I truly have no proof of lies or wrong doing on his end. So why the sudden change? I don’t know what to do here. I’ve tried my best to push the feeling away and get over it because I’m not the type to nag about it but 3 weeks and I feel like somethings wrong. What do I do here?