I'm protected from the pill. Is this true?

I take the pill ( Sprintec 28 )and have for about a year now. I take it between 4 and 5 everyday. The man I'm with has ejaculated inside me the last 3 time having sex and I have never let him do that before. I've heard you can not get pregnant and that I'm protected from the pill. Is this true. I'm nervous since these were the only times I have ever let him do that.

Even though i track ovulation one of those times i was fertile, even though i was on the pill. Does that have an effect, or even matter?...