I did unprotected sex on 11 th April it's my period date also but that day my period didn't come nd my period late by 6 day means came in 17 April nd I did pregnancy test on 13 April nd that was negative nd after that on next month my period again late by 10 days means my period came on 28 may pls tell me why my period getting late. Or is any chances of pregnancy pls clearly this I am so worried about this.