Today I got my bfp ... the same day I found out my boyfriend was cheating

So today I found out my boyfriend cheated on me with his best friends sister. He is “speaking to her” as in they are going to get together but he is denying it, saying I’m crazy and hasn’t let it change his mood at all.

1 hour after this the app told me to take a pregnancy test so I did, and to my surprise it was positive. 7 years of trying, clearly 7 years of cheating and now I’m confused stressed and feel physically sick.