anyone else with low hcg?

I had 2 positive frers and went to Dr yesterday and got blood drawn. they called to say we need to retest bc hcg is only at 10. backstory: I had a weird period July 4-8 and then randomly spotted the day after I got a peak smiley on my opk... normally my boobs hurt right after I ovulate for 2 weeks till my period. they just started hurting yesterday. I don't know whether to be hopeful or sad. thoughts? experiences?