Went off bc 4 months ago. Irregular period last month and missed all together this month. Negative urine/blood test. Can I still ovulate? Something wrong?

Be patient, see GYN. It may take several months after being on birth control, and then stopping it, to regulate your period. Eat well, stay healthy, and your period should return to normal (if it was before you went on birth control). See your gyn and they can do some testing on you and help discuss best options for pregnancy. Best wishes to you.