The haftara of Naso begins in Shofetim 13:2 and extends to the end of the perek. As such, one pasuk is cut off from the perek. Or rather, the Christian perek divisions do not necessarily accord with the haftara unit envisioned by those who set the haftarah up.
What is that first pasuk? Shofetim 13:1:
petucha separating it off from the rest of the perek. But then again, there was a petucha gap separating that pasuk off from the preceding section:
We are not told when Shimshon was born. Did this follow in the sequence? Shimshon might have been born during Hillel's lifetime, and only began fighting the Pelishtim and thus judging the Israelites for 20 years later on. Or during some of those intervening years. The pesukim are not clear. Perhaps we might be able to make some estimates on the basis of his parents working to arrange his marriage for him, but quite possibly not.
At any rate, Ralbag takes note of the pasuk in which the malach appears to the wife of Manoach, and tells her:
seem to indicate that this can be dated to the era of yad pelishtim of 13:1. On the other hand, he considers seriously that the malach here is telling two messages: one, that in the first place, there would be a subjugation by the Plishtim, and two, that Shimshon would save Israel from them. If so, there is no way to decide.