I just started my pill form of BC. So I'm on week three of my birth control. My boyfriend of four years and I decided to finally have sex- skin to skin. we have only ever used condoms. So, we did it. He got nervously toward the end and pulled out right when he felt he was going to ejaculate. I am aware of the risks of pre-cum. Is there a slight chance I could be pregnant this far into birth control?