Thanks for the query.
If you had unprotected intercourse
around the period when you have seen mature follicle then there is possibility for pregnancy
As according to this your ovulation delayed, you better repeat the blood test
after 3 weeks of your ovulation.
In case of pregnancy this time blood test can give positive result.
If result comes negative you better get evaluated for the cause of scanty flow during periods like poly cystic ovary disease etc.