Suggestions welcomed!!

I got a negative opk on July 26, 27 and got a positive peak a solid smiley face on July 28 it’s now July 30 so my first digital positive test is gone now so just out of Curiosity I wanted to test to see if I would get a different result or something but when I tested I got another Solid smiley face. (Btw I’ve been experiencing a ton of twings and light sharp pains in my stomach on both sides) I’m currently on CD 19 this is my first cycle trying and now I’m all confused! BD on July 26 & 29th! What’s going on!?