That actually happened to me while having sex with an ex of mine. He came (I was on the pill and he was wearing a condom) and when he pulled out the tip was gone!!
I was freaking out....but more so about him coming inside of me. (A few of my friends have gotten pregnant on the pill). So I kinda actually forgot about the tip. Then he kinda flipped out too....because he had never actually come inside of me unless he was wearing a condom....(but it had never broke before).

Then about a week later I got my period and after pulling out my tampon.....i went to flush the toilet and there was the tip (of the condom) in the toilet. I was like wtf? Then Im like.....oh yeah thats right....(I had completely forgotten about it.)

Gross it was yes....but I got no infection. IT just came out naturally. (And yes he was wearing a magnum....but I was kinda dry..(due to the birth control, it has that effect on me) and we were outta lube.....

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Appreciate the good times and learn from the bad times....