It is very possible you could be pregnant, the only way to be sure though is to take a test. Do you have regular periods? Do have a idea of when it might have been around? Take a test and if it is negative, wait a few more days and if still no period, take another. It's kinda hard to tell when to take it since you aren't really sure when your period is. If you are regularly in the past around 28 days like most people, then you know you haven't had it in the past 2 or 3 weeks considering you remember spotting a couple of weeks ago. If that is your regular cycle and you go over 2 more weeks with all negatives, I would recommend making an appt with your doc to see whats going on. If your cycles are irregular, you can test but it still may be nowhere near the time for you to be able to tell your pregnant. Good luck, hth!

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I think you should do a test and see the doctor.