What are the chances i'm pregnant?

I started on the pill June 22nd, same day as my period... Had unprotected sex with my husband the same day, 23rd, 24th and 26th. I know when you take the pill on the first day of your period you should be protected but i'm just a bit unsure because i bled for 1 day, stopped for 2, bled heavily on the 25th and stopped and now have been spotting. When you start the pill, does your period stop a couple days then start again? Btw, i'm ready for a child (have a 3 year old) and my husband desperately wants another... So i said if it happens while i'm on the pill we'll go for it lol.