hello and thank you for asking HCM,
I understand your concern and this spotting could be ovulatory. You said your last period was 2-3 weeks ago which means that you are now probably ovulating. Sonetimes women have spotting during this time. The chance to get pregnant with tide tubes is less than 1%. But if you are concerned you can make a pregnancy
test a few days before your next period, or you can just wait your period to come.
If you will feel cramps or experience harder bleeding, visit your gynecologist.
I hope this answer was helpful to you.