bfp 5days before af

Hi ladies, 

This morning i have just gotten a bfp on a frer,  period is not due till saturday (5days) but i felt different this month so tested. It is a good line not faint and It was my second urine of the day. I just wanted some reassurance that this happens and people went on to have a healthy pregnancy. I am scared i will still get a period and its chemical even though when i had my last chemical the line didnt appear till 1 before my period and was so so faint. 

Thanks ladies, sorry to moan i no i should be jumping for joy. X