Pre-cum/pregnancy

I am still a virgin and my fiancé and I have decided to wait until marriage. However, the temptation is still there. On day we decide to take a shower together and as I was standing there, he brushed against the outside of my vagina. I quickly moved it to the side. I was on my period and I started birth control a couple days later, however I am late with my period this month (which isn't completely abnormal) I have been reading all these posts about pre-cum and it siked me out. Is there a chance I could be pregnant?