I got a +opt on day 12 and now I am getting another +opt on day 17....?

I am currently on calendar day 17 and have fertile like cm( and have for the last two days...) so I decided what the heck I am just going to take a opt.. and it was positive.. so a few hours later I took another one and it was positive too... Now this wouldn't be an issue if one day 11 I hadn't gotten a +opt... But I did.. So on day 11 and 12 I got +opt, and now on day 17. What to believe?? I am soooo confused!!!!! These are new opt's and I am so unsure.... Either way we are going to bd but what would be the reason I would get two??? Someone with experience and knowledge please help!