Last month, I had some period-like bleeding on the 15 Sept/2016. I thought it was my period because I lost my calendar data about the previous period date (but usually it's at the end of the month). On the first 3 days (from 15-17) I had some brown clot like the old blood, which is normal because I usually have it for a day right before my period (3 days is unusually though). But then the next day I had some blood (just a bit) on my daily pad only in the morning and it's gone for the rest of the day. I did 3 times pregnancy test and they're all negative. So I thought it's just my period pattern changed.
After almost a month, I had some brown clot again (21 October) so I thought my period is coming. But when I put my pad on there's nothing. I only see some blood when I wipe. This situation continue including today (23 October). From last month till now there's no cramp or sore breast at all (I usually have these when I have my period).
Would it be pregnancy or something else?
P.S. I'm 22 years old and my bf and I usually have unprotected sex (trying to conceive).