CRJ-200 First Officer reported EGPWS warning and unstabilized approach.

Narrative

While on the approach to landing in gusty conditions; a single audible 'sink rate' sounded. As pilot flying I pitched up and added power while announcing 'correcting.' Approximately 3 to 5 seconds later another single audible 'sink rate' sounded. again; I added power and pitched up. At the second 'sink rate' I scanned my speed and VSI and observed them to be within the stabilized approach criteria and elected to continue the approach having internally considered calling for a go around. The flight continued and landed safely without incident. During the debriefing portion of the post-flight; the captain commented he had momentarily observed a VSI of 1200 FMP and that the approach may have been unstable. Though I believe I responded promptly to the 'sink rate call;' I failed to verify the HAT (Height Above Touchdown) at the time the audible warning sounded and believe a go around would have been the proper course of action as a result. The cause of this event was my failure ensure stabilized approach criteria were maintained. I believe the gusty wind conditions contributed. Additionally; I believe I was subject to confirmation bias; when the captain did not call for a go around; I assumed that he agreed with my assessment that the approach was still within stable criteria. While we had briefed the gusty conditions during the approach briefing; a briefing of the stabilized approach criteria and specifically that any EGPWS notification below 500' HAT requires an immediate go around would have avoided this event.