More than one day with LH surge?

Anyone else have more than one day with an LH surge?

I took a test Thursday night (the kind you collect and dip test in) and the test line was just as dark as control. Then Friday night the test line was darker and showed up immediately. I tested again first thing Saturday morning using the same type test but two different brands and both showed a positive. I got the same thing Saturday night and now this morning. According to Glow, my peak day was Thursday and my next period is due the 16th; had sex a few times this week. We are TTC for about 7 months now.