Good morning ladies so I'm new to this app lol! I had a question me and my fiancé are trying to…

Good morning ladies so I'm new to this app lol! I had a question me and my fiancé are trying to conceive my last period was March 22 me and him had sex April 11 and 16 I was supposed to the my period April 19/20 and never did since 2 days ago I just been having brown blood and my tampons and pinkish sometimes brown when I wipe. Can this be IB? I've taken test but they came out negative!