In the present scenario, you should wait for your period and if you do not get it, get a pregnancy
test with a fresh early morning sample 3-7 days later. It is true that pre-ejaculate
can cause pregnancy if intercourse occurs around the ovulatory days as it contains enough sperms to fertilize (A single sperm is enough). You should see a doctor if you have a positive test for pregnancy to discuss future management. Good luck.