I Have An Irregular Period. The Last Day Of My

I have an irregular period. The last day of my last period was on Oct.12. I had intercourse for the first time last Oct. 30. Now I feel that was my ovulation peak. I haven't taken any tests yet, because I heard I should wait for 3 weeks to check. But I can't waste any time, every minute counts. I'm starting the Vit. C not more than 6,000 mg per day, to induce miscarriage. I wonder if that would help. Cause I can't afford to be pregnant this time. I have a weak body.