Our expert says:
As you have already pointed out, the chances are really slim given that (a) you had not ejaculated yet and pre-cum may only contain small traces of sperm if you had ejaculated relatively recently (i.e. earlier that day or in the sexual session with that partner), (b) you wiped your fingers so one would think that any sperm which might (small chance) have been on your fingers was likely exposed to air/wiped off, (c) you also did not insert your fingers... So, the chances are very, very slim. However, if you do not find this to be enough reassurance, emergency contraceptives are not harmful and so could be taken to give more peace of mind (remember these need to be taken within 72 hrs).
Maybe this is a good time to think about you are doing regarding contraception and STI prevention the rest of the time? Condoms can be worn during oral sex (nice flavoured ones can add to the experience), just make sure you replace any condom with a new one before penetration as the teeth can cause damage to the condom...
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