Hello sir and thank you for posting your query here.... I will definitely help you out.. Welcome to HCM.. I being a surgeon, we encounter so many such cases such cases day in and day out.. I read your question completely and have understood it well.. I will analyze all your points.. And provide the possible explanations.. 1. Masturbated 3 hours before sex will definitely reduce the chance of pregnancy but does not rule it out. Yes, post ejaculation it is advised that it takes about 24 hours for normal sperm concentration in semen. So there are definitely, less chances of pregnancy.. 2. You say, you had sex without condom initially and then you put on one.. Well, again, the main question is did you ejaculate inside of the vagina or no, becomes important. Two scenarios arise here.. A. In case you haven t ejaculated, then I can say with certainty that there s no chance of pregnancy. B. In case you are sure that you ejaculated inside of vagina then, there is a reduction in chance of pregnancy taking into consideration the 3 hour before masturbation. 3. We have to wait.. And hope that she s not pregnant.. And you didn t have post coital tablets, so chances are there.. Hope this helps you, in case you need any further assistance, please let me know.. Take care and God bless..