Opks and so much confusion!

I'm not one to post but rather browse through posts to find answers...however this one is tricky.

According to glow I should ovulate today. I've never used opks(this is only our 3rd month ttc) but decided to get some today to see if it was positive and I am in fact ovulating on time.

So I took one around 12:30 today and it was positive.. then took another around 5:30 and it's negative..still a semi-dark line but not as dark as the control line like the one I took earlier. We bd yesterday in the morning but have to wait until tonight to bd again.

My question is..because the one I took at 5:30 was negative is it too late to bd again?

Does the LH surge drop before or after ovulation?

Is there still a chance we can catch the egg?

*ttc can be so stressful. 😔

Thanks in advance!