My cycles are normally 29 days but they can range from 26-31 . I had unprotected sex on the 26th of march and my period was due on the 30th . The 30th came and my boobs are sore , and all i've had was white cervical mucus , no blood and I have this bubble feeling on my left side and somewhat on & off sharp pains . Today is the 31st , even though 1 day late isn't a big deal . Does anyone know or heard of anyone getting pregnant 4 days before their period was due ?