Positive test after period????

Kay • Mama of 1 [4 years in the making]💙 👼🏽 👼🏽[IVF Warrior]

So I miscarried in August. Had my first period September 9-11 (did not ovulate at all). Then got a positive OPK September 22 ovulated (confirmed by my clinic). Then I got what I thought was my period October 3 (was due on the 5th) and bled for 4 days. I went back to the clinic for a follow up and they told me my beta was 2.5 which was weird because I tested a few days prior cuz I thought it was weird my period was early but only got negatives. And sure enough …

I know my beta had to rise to at least 6 to get a positive on the early result first response so, what does this mean? Chemical? Possible ectopic???? I’m just so nervous but trying to be hopeful! Advice or like stories would be very welcome!!!