Out of time frame but pink line? bfp or evap?

Christine • MC at 5w and lost baby at 17w due to chromosomal pathology. TTC for each of them for 8-9months. TTC again since September 17. Physiotherapist.
Took a hpt and within 5 min I thought I can see a squinter. But after 20 min I saw faint pink line. Could that be bfp or an evap? Are there pink evaps?