Low beta

Shay
Hi all! Sorry to insert myself in this community when I haven't posted previously. I have read a lot  of threads though and you all have made me feel much better about many things, in the very least I don't feel so isolated. 
I'm 8dp5dt (FET) and got my beta back. It was 25. My nurse told me the test was positive and then almost told me the number as an after thought but when she did I just blurted out, "Oh. So really low then." And then she said "Well yeah, but don't lose hope or get discouraged."
Well, that's exactly what I am. This is our second round of IVF (first beta was 89 for that one). We did a fresh transfer in February and I miscarried in March. We're severe MFI, thus far no findings related to FFI. 
I don't know what I'm looking for here. Maybe stories of low betas with positive outcomes?