Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. The technique or method of withdrawal is a widely used one to avoid pregnancy. But its efficacy depends purely on experience and of course some luck. Semen always sprays rather than drips. Accurate withdrawal needs experience. Even one minute drop of semen contains millions of sperm cells of which even one can make you pregnant. Therefore, rejecting the possibility 100% is not possible. Secondly, there are other matters which determine pregnancy like the period factor, stress factor, female egg strength etc. You need to wait for a month or so to correctly determine. For safety, there are pills available which can be taken upto 72 hours of intercourse which helps you avoid pregnancy. But for that you need to consult your glaciologist. Hope this answers your query. Available for further clarifications. Good luck.