Pregnancy and Prednisone???

I spotted on CD 10 & 11 and BD on CD 10 & 12. I never spotted as an Ovulation symptom before so we BD multiple times on those days. I was diagnosed with pleurisy Thursday so the dr prescribed a corticosteroid for me..he had me take a test but said it was negative but he wasn't sure because I was 10 days from AF at the time. Should i be okay if im pregnant? Do you guys think i could be. I have NEVER spotted as an ovulation symptom before so we BD alot those two days...