Could I still be pregnant?

SM

Hi, so I have been on the pill “Levlen” for about 4 months now. Last week I had sex 3 times without a condom but my boyfriend also pulled out every time. I started my “sugar pills” on Sunday night and got my period on Tuesday. It started off light but is now relatively heavy. But I cannot help but stress about possibly being pregnant even though we have taken all these precautions and even though I am on my period!