TTC after depo- Tesco Evap?

Hi guys, 

just wondering what experience you guys have had using Tesco own brand? I took one the other very early morning and glanced at a bfn but when I got up properly after an hour there seemed to be a very clear positive. I know this is against all rule as it’s after the 10 min mark but the line seems blue!
i then done a CB digi the morning after and received a bfn. I haven’t tested since but still have cramps and feeling super tired.
I am now coming up on 7 months from my last drop, had spotting the other week but apart from that no AF signs. Does anyone have any advice on how to kick start things if I’m not preg?
attached photo of the phantom bfp xx