If I have unprotected sex the day before my period is due when should I do a HPT?

I had unprotected sex then 3 days later I started my period when I wasn't suposed to for about another week. Is it possible I could be pregnant?:confused:

Me and my boyfriend had unprotected sex two days before my period and came inside of me now I'm a day late for my period. Could I be pragnant?

STRESSED! The first day of my last period was May 13th, 2009. My ex & I had unprotected sex on May 31st, 2009 (we did the pull out method 2 times). I was supposed to get my period around May 8th or 9th & didn't get it until May 16th & it was noticeably lighter & ended on May 17th. I took a digital...

Hiya, I'm new to this but just a quick qestion. Now today (17th Nov 08) I had unprotected sex with my partner as were trying for a baby. I think its been about 2 weeks since my last period. Now I'm trying to work out my due date but one website is asking me what is the last date of my period. Now...

My period usually comes on the 6 of the month. Me and my boyfriend having been having unprotected sex almost every day for two months. Last week on two separate occasions after sex I was spotting. And yesterday my period finally came down heavier then before......what can be going on?