18 and ttc

A little back story I got pregnant first try when I was 16 almost 17 here I am 18 almost 19 and trying again. Please no judgement. My donor came down this morning I went over and we DTD I had a negative ovulation test. Then before I go over again tonight I come back and i have a positive! Again I went tonight. I will be going back tomorrow morning and tomorrow afternoon. What are my chances of getting pregnant?