I don't think they'll be too concerned, tbh.
My experience, if it helps is this:
My youngest managed to fall down the stairs at 10 months old and again at 14 months old (from the top both times).
The first time she managed to climb through/over the banister whilst I was making a tea (we only found out how when she tried it again when I was in the room, so we blocked it off)
The 2nd time a visitor left the gate open when she went to toilet (whilst I was making us both a tea) and she saw her at the top as she came out, but couldn't catch her.
I took her to A&E both times and never had a follow up (thank God, she wasn't even bruised both times!!!).
I went again at 18 months when she dislocated her elbow on a trampoline, and that time we did receive a call from the HV afterwards calling to check my version of events, which they were happy with and she told me the reason for checking up was because I'd had 3 incidents within a year and because the elbow injury was a bit of a red flag for medics.