Just really need some advice/encouraging/advice

Went to the doctor Wednesday for them to check my hcg levels and everything they told me my urine test came out negative so they drew my blood and was telling me to prepare for a miscarriage bc I’ve had some like spotting on Monday barely anything I’ve had no spotting/cramping since then so I waiting to get my results which my HCG levels ended up being 21 (I think I’m around 4 weeks rn) they told me to come back in to be retested Sunday to see if my number are going up or down (I’m still getting a positive pregnancy test at home) my boobs have been sooo sore for the past two weeks and today I’ve realized they’re not so sore anymore I’m just wondering if that is a sign of me miscarrying