I have pretty regular periods that last about 4-5 days each month. This month, I started noticing dark brown clots one week before my periods when I wipe. This lasted an entire week but then I got my periods on my regular date. However, my period only lasted 2 days instead of the usual 4-5. The flow was quite regular and pretty heavy as it usually is. After 2 days of periods now I've just been noticing some blood when I wipe. Is this type of period normal or could I be pregnant?

We always use condoms except this one time when there was genital contact without condom but no insertion or ejaculation inside so it seems unlikely and I have no other pregnancy symptoms.

Does not really sound like pregnancy. It sounds just like a off or different period this month. I would wait till next month and see what happens. If concerned about pregnancy you can wait about two weeks and try a test.