Could I have conceived last week?

I recently went away on a blow out weekend, I am on the pill but unsure of weather I took it every day. Whilst away I had sex I have been back a week and came off my pill as soon as I got home even though I was unsure of where in my cycle I was, I have had light bleeding for two days. I was unsure of weather I would be able to experience a period this month but stil have conceived last week.? please can you advise.
Thanks

I really dont know what to say about your situation. I always heard if you miss a single pill and still have sex you can get pregnant. But just be careful with your body until you do know if you are or not. I was on birth control and I took it every day and I got pregnant. I guess I was in the percent that the birth control did not work for. Good luck.