DP fell asleep with his phone on the bed instead of putting it on charge.
I never usually do this/haven't done it in a long long time, but I looked through his phone.
On fb messenger app in the search bar a girl came up who he used to see every now and then (think FWB type). This was complicated as his DM was best friends with her mother and they grew up together, but nobody knows that they've slept together on numerous occasions except me.
Then on Instagram he'd searched for another a girl, one he knew back in primary school.
I know i might just be overreacting but do I ask him about this? Feeling very hormonal due to pregnancy and paranoid 
