Test 7/7 First Response Ov Kit-LH surge or No surge? Help?

I have tested each morning for the past 7 days. This is the last test in my kit. My cycle has been irregular since coming off the pill after 12 years. This is the darkest test line I've received all week. LH surge or no surge? Does the test line get darker as your body gets closer to ovulation? Any advice? Should I keep testing?