Ovulate twice in one month???? HELP!

I had a positive opk on 10/5/17, surge went down over the next 3 days. Did another opk this morning (10/9/17) and it is positive! What does that mean? My husband and I BD everyday during my fertile period which ended yesterday. He just left town for 3 weeks and now I feel like I’m going to miss my chance this month :(