You are suffering from irregular vaginal bleeding
and it may be due to adverse effect of contraceptive patch
or other things (uterine cause/hormonal
Do a fresh USG of lower abdomen to rule out underlying pathology if any.
If anything rule out,then treat accordingly with consult of gynecologist.
And if there is nothing,then choose different contraceptive patch with less adverse effect or failure rate. Use in correct method and periodic check up to your doctor if any abnormal bleeding.
,take healthy diet,do light exercise and proper sleep.