Thanks for query on HCM.
It is very early to say for pregnancy
.You have to go for urine pregnancy test on at least after 8th day of missing cycle.It shows late reaction in some patients.
You can also confirm it by blood hcg
level and USG.
Sometime spotting may occur even in pregnancy.
If pregnancy is negative than it might be due to hormonal
Get examined by gynecologist for further guidance and proper medical management.