Chances of pregnancy? Late period

I’m currently on day 40/41 of my cycle and still haven’t gotten my period. eve has me at 10 days late -give or take. The only time my cycle has ever been late was last year @ 7 days late, followed by 9 days late.. I assumed this was just a time I was late, but I’m day 10 and still nothing.

I took a $1 test on day 5, it was negative.

I took a stick test on day 6, also negative (didn’t pee enough on it) so I got a third test yesterday on day 9. Same stick test.. also negative.

My doctor sent a script for a lab to get tomorrow.

What are the chances my blood test says I’m pregnant? When I’ve had 3 negatives??

(Also, I’ve had slight crampiness off and on for the past 8-9 days, but no spotting or bleeding)

(Also for a couple of days I had very faintly tender boobs)

My discharge was a creamy cloudy color, but not thick. Then recently I’ve had more of a watery clear discharge.period