HELP!! SO CONFUSED!!

Okay so we have been TTC for three months and I have always been able to tell you exactly when the day my period is going to start. But the first month I didn't start then a couple days after I got a faint brown discharge for a few days then nothing. I took HPT multiple times and it was always negative. Not getting my period I even went and got a blood test done and it was negative. Second month I did bleed for a couple days and then the third month is this month and I'm supposed to start on the 5th and just today the 9th I had a little brown discharge and that has stopped and I took HPT and they were negative... has any one else had TTC make their period just stop??? I feel so bloated all the time 😔 help!!! 😫😫 so confused!