I hate depo...but I have a question

My depo shot ran out on the 4th of November. I had two periods after that in cycle ish (27-29 days) and now it's been over a week since my period was due. I took two HPTs. One the day before my period was due (just because of ? cycle length) and one two days later and both negative. Could they be false negatives? I know you shouldn't expect pregnancy within a year of having depo but all three of my pregnancies (one ended in MC) occured well within a year of a depo shot.
Yes I know that depo shot is a bunch of crap. I really hate it. I just needed 12 weeks with a guarantee of no babies lol