I think my boyfriend is going to break up with me

Brittany
For the past month he's been turning me down every time I want to have sex and I noticed today that he's changed his relationship status on Facebook from 'in a relationship' to just nothing! 
I know he did it in the past few days because I was on his page on Saturday and I saw it set to being in a relationship with me and I have next to no idea what I could've done to change his feelings for me other than when I called him last night.
I was on the verge of an anxiety attack because my period was late so I called him and I said something like 'I'm about to freak out over something stupid' and 'I know my period is probably just late because I changed my period but I still can't help but be scared.' 
He said something like 'babe, there's no way your pregnant, don't be stupid.' And I was pretty sure I wasn't because not only am I on birth control, we also use condoms and he pulls out.
Then he said hay he had to go and he hung up. 
The whole conversation lasted less than a minute, and it pissed me off because I was scared that I was pregnant and he didn't even take the time to actually talk with me.
I think that the conversation might have scared him a bit and that's why he changed his Facebook status, that or he was talking with his ex fiancé and he didn't want her to see that he was dating again since I'm the first girl he's been with since her.
The worst part is, I'm completely in love with him, but I haven't told him yet because we've been together less than four months and I don't want to scare him away, and now it seems like I'll never have the chance to tell him.