Is it possible to ovulate 5 days after an LH surge?

I had a positive ovulation test on day 13 but on day 18 I had pain in my lower abdomen, in the left pelvis area, as well as lower back pain, fatigue, hot flashes and a little nausea and fatigue. I'm wondering if ovulation could be the reason. I know that it cannot be a second ovulation, as it can only happen once in a 24 hour period during each cycle, but I've read that stress can sometimes delay ovulation. But I don't know if the surge needs to be delayed also for that to happen. Or could this perhaps be a cyst after the ovulation last week? Any thoughts? I took pergotime (same as clomid) on days 3-7 by the way.