hi,im 28 years undergoing a treatment,my cycle is irregular....doctor has advised b-long f,hyponidd,fertisure-f, for 3 months.....this is second month an no periods came till now 18 days overdue.........i took a test on 14 day but it was negative...i am very tensed what to do.........the doctor has advised to stop the medicines for a while............what could be the problem pls suggest me.........can i be pregnant