Thanks for query on HCM.
Mid cycle spotting sometime occurs during ovulation phase,no need to worry for that.
You can confirm the pregnancy
by urine pregnancy test,blood hcg level and even by usg.
If pregnancy is negative than most likely it is due to hormonal
Better start oral contraceptive pills
,it will be helpful to regularize your cycle and at the same time you can also avoid pregnancy.
Go for certain investigations like cbc,urine,rbs,thyroid
profile and hormonal study and consult your gynecologist for proper treatment and guidance.