Pregnancy Tips

My hubby and I (23&22) have been trying to convince since February with no luck. Should we be worried yet? 
We have been having sex more frequently these past few weeks and I just got my period today.
I am always on top when he finishes, so maybe gravity has something to do with it? I always let the sperm drip out as soon as we finish too, should I wait longer?
What are your baby making tips? 💕