what r some behaviors of someone cheating in a marriage?

[Valerie]

i have a feeling my mom is cheating on my dad and i hate thinking it bc i'm pregnant and not suppose to stress but its been stressing me out a lot but i got to know bc its harming me and my little girl. The reason i think she is cheating is because tonight when she got off she sent a text saying she went to walmart then i thought um she told me she was stopping at the store this morning before work because she left early. So then she calls and says hey im at the bar so then i was thinking wouldn't the food spoil? then she comes home at eleven at night no groceries in her hands or the van and she told my dad that her friends husband dropped her off at home from the bar and somehow the van was already here. she would of had to already be here once so that confused me so then my dad started getting curious about wat is going on so when my mom fell asleep he texted a number that was under the named judy a girl she claims to be friends with at work but then "judy" texted her phone and said hey wanna fuck then i texted back to mess around so i could find out who it was and they kept asking questions like that and questions like where you at. so i call the number and act like her bc me and my moms voice is kinda alike and i said hey its wendy i can't sleep and need someone to talk to so then i hear a guys voice say where are you and i say at home and then they were like oh well i need some ass and then i said your crazy and they hung up i think they caught on and everything and it feels like shes been cheating bc this isn't the first time she has stayed out after work and went somewhere with this woman or man so idk what to think can you help me out and tell me what you think it would be a big help?