Hello I started taking birth control(Microgestin 1/20) for the first time on the 19 of March (the Sunday after my last period) and then I had unprotected sex with my bf on the 23rd of March but not for long (like 5 strokes) because we didn't have protection so I told him to stop. I know for sure he didn't cum inside me . But I'm worried because  I forgot to check my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> because the 23 of march was the first day of my fertility period. Can I still be pregnant even though we didn't go for long at all and he didn't cum inside me?