How late were you?

I know everyone is different, but I wanted to know how late were you before you tested positive? I posted back in December about taking steps to get in better shape(since I'm overweight) to hopefully concieve. Dr gave us a three month span to see what happens. (Taking
Centrum and folic acid along with a better diet) I lost seven pounds the first month and skipped this months visit. I got my period like normal in December and I was due around 5-6th of this month. I started going to the gym(before I had my period in December) and I've been going more. I know I'm losing more weight, I just don't know exactly how much, but it can't be a big number, but I've skipped this month. I was hoping for a positive but I tested a day after and it was negative. Tested a week later and still negative. Now here I am about three weeks late and I'm
getting what feels like stomach cramps/spasms and I've had some minor cramps. I've noticed I've had a few major mood swings the last week or so, and this is tmi but I've noticed these little white bumps like look like pimples on my nipples 😫 I'm pretty concerned cause I've never had those before. Apparently from what I've searched some woman do get those while pregnant. Is it wishful thinking that I can test positive or maybe just changes cause I've been working out more?