Positive internet cheapie BFN clear blue digital

I'm so confused. I feel pregnant, I have been getting extremely faint BFP's on both internet cheapies and FRER. I think I ovulated on the 3rd April, the same day I had my coil removed so it seems unlikely but not impossible. That'd put me 11dpo today. However I have had the words 'not pregnant' flashed at me yesterday and this morning. I have been nauseous, gassy, had a nose bleed (had that with both other children), nipples look darker with tiny white spots, I can't sleep through the night without peeing and a much heightened sense of smell. The BFN's have thrown me. Do you think I could still be in for a shot?