3rd baby???

Freaking out! I have a 20m.o and a 3yr old and I feel pregnant again (af isnt due for another 2 days but i experienced spotting on the 17th). Just wondering the gaps between your three children and if i'm going to lose my mind?? Lol. Totally not ready for three, and we did take precautions but my first is a bc baby so i've proven to be very fertile😣 Thanks!