TTC Newbie

We finally decided to try for a baby, but I didn't realize how much planning and tracking would need to be done! I'm not sure how long each cycle is but my last AF was Dec. 3rd so I figured this is my fertile week. We BDd on Saturday but not again until today. TMI but he finished in me three times today. Do I have a decent chance or should I just start prepping and tracking for my next cycle?