So, here is how it works to calculate your 'more' fertile time--- but first I must tell you that there is NO safe time. You can get pregnant at any time in your cycle and pulling out doesn't protect you. Men emit pre ejaculation and this is enough to get you pregnant. So, here is how a cycle works-- the first day of your cycle is the first day of your period. So, in this case, March 3 is cycle day 1. You begin counting from there. Sperm can live for several days inside the vagina before ovulation so a doctor will tell you the time in a cycle that is most fertile is cycle day 9 through the 15th day of your cycle. March 11 would have been day 9. But, you are on the patch. You were late putting it on? I'm trying to understand what you are saying about that. That's using protection which is great. Try to be really good about putting it on right on time. But I would think this makes pregnancy very unlikely. I really do. I rambled here---- LOL. But those are my thoughts. good luck