Ovulation

Nitzaliz • Due Dec 1st💘
So I'm confused and I need a little help. 
From top to bottom 
1st test- On the 11th I got a positive lh surge 2 days after my period 
2nd test- I tested again on the 12 to see if I'm still in the game... Results told me I wasn't so I just didn't test again till the 16th
3rd test- on the 16th I test again out of curiosity and I got a negative 
4th test- I went to the store to buy the clearblue ovulation test and decided to test 1 test out and leave the rest for my next cycle but then I get this and I'm confused like do I keep getting busy? I only had sex on the 11th