tmi. sorry. what's going on??

So my boyfriend and I had unprotected sex the day after I ovulated and my period is 6 days late. Two pregnancy tests said negative, but I have quite I few of the sign and they're ones I don't get with pms. A few days ago I had a red/brown bit of discharge when I wiped but haven't had any since. Did I test too early or am I just going crazy?? Haha I tested this morning so would tomorrow morning with a more expensive brand be too soon to test? Thank you ladies!💗