Confused - 10 DPO, BFN and AF late

So.... Mirena coil came out 24th June and I had light bleeding 26th and 27th (like heavier than spotting but nowhere near period bleeding) positive opk on 30th June. We have BD every other day since. I'm now 10 DPO with BPN pregnancy test. I felt extremely nauseated yesterday morning and have no PMS symptoms apart from tender breasts. I know you'll probably just say re-test in a few days, but I'm curious if you've experienced anything like this.