opk question. is there another lh surge before Af?

I am waiting on my amazon delivery of pregnancy tests. I knew better not to entertain the idea BUT I did. I know opks can pick up the hcg. So I had extra opks and we'll ofcourse took some (3). 2 yesterday and one this morning.  So I know how light They can get after ovulation and ofcourse know what a positive looks like.  My question is, is there another LH before AF is due? If there is does anyone know how long before? She's due to show around 3/12-3/13.  Attached is the opks I took 2 on top from yesterday and he one from this morning. I know these are "negative" but def there. any insight would be great I have never taken them this late in my cycle before. Just curious !!!!