Need advice

Me and my boyfriend has sex for the first time on Saturday, I'm on the combined pill which I stopped taking on Sunday for the 7 day break. I haven't came on yet and I usually come on straight away but I was thinking there could be a delay, if I don't come on by the end of the week I'm going to tell my boyfriend but if I don't then I don't really know what to do. Has anyone else had this problem before?