Need opinions?

So I am 2-3 dpo today. We bd pretty much every day before and after o so kinda hoping this will be our 4th and last baby, hopefully a girl since I have three boys. But I also have a colposcipy on Wednesday for some pains and issues I've been having. I may possibly have cancerous cells and I got hpv when my eldest son's father cheated on me years ago....but Wednesday I'll be 6-7 dpo and even if I did manage to hit the market I won't be able to know that early. Neither will the drs. But I'm a little worried. Idk if I should test so I can let the Dr know. Also we were thinking about being put on birth control because my bf says maybe we should wait for baby #4 but I dont want to take bc if I'm prego of course. Is there anyway I can know by then to know which direction to take here and be safe if there is a baby in there ? Blood tests maybe ?