8 day period dec 10-18, 4 day spotting jan 12-16. Positive hpt jan 16/17. Negative hpt jan 23. No bleeding. Any idea what could be going on? :- (

Early miscarriage. If you truly had a positive home pregnancy test followed by a negative home pregnancy test, you probably had a very early miscarriage. Most miscarriages occur before the patient is even aware that they are pregnant. You should speak to an obgyn to discuss your concerns.