Is it safe to continue intercourse in a condom with semen?

The condom should be removed immediately after ejaculation. Do not try to "prolong" intercourse after ejaculation, or restart intercourse in the same condom. This causes the risk of pregnancy to increase, even if the condom has not broken. One of the reasons is the decrease in the size of the member immediately after ejaculation, which can result in sperm leaking from the condom into the vagina. It is up to you to assess the situation, whether the intercourse (2 pushes) in a filled condom could have caused the above.

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To @giuseppe:

It is not recommended to reuse a condom as this can increase the risk of sperm breaking or leaking. Using an ill-fitting condom (e.g. stretched) can increase the risk of infection and an unplanned pregnancy. Sperm live in a woman's genital tract for about 3 days and if ovulation takes place during this time (maybe around day 10 of the cycle) fertilization is possible.

But what if, after having had intercourse and reusing the same condom, the percentage of risk is so high if the condom was not pierced in any way?

To @Napato: I am not able to give such guarantees or warranties :) If you think that the sperm did not have the ability to leak out of the condom, then probably nothing happened.