it finally hit me

PLEASE NO JUDGEMENT AT ALL! Im pregnant and just decided I will continue with this pregnancy, my first OB visit and ultrasound was at 7-8 weeks and I never been back since, I was planning to terminate this pregnancy for many reasons I don't wanna say but it's such a horrible story. With my health being so bad it took months to get signed off to terminate my pregnancy however I just took it as this is Gods sign for me to having this blessing. I don't know exactly how far I am, I never took prenatal pills, I don't know my baby's gender and due date. I'm going to be calling my OB doctor for a follow up and I know they will ask me questions on why I never returned. I'm a single mom and have been alone this entire pregnancy and I have no problem with raising this baby alone. With me being so far in my pregnancy what should I do? I been hiding this pregnancy for a long time, when should I tell my job? Do I have to apply for maternity leave now? My firstborn was premature and according to my first and only ultrasound I will be in my third trimester 3-4 weeks.