Wondering

My peroid is late by 6 days according to glow (it's hasn't Been  wrong before)my boobs are sore mild cramping like I'm about to start menstrating and cm is yellow also very dry down there.i took a pregnancy test today (the 6 day mark of being late) and it was negative I was planning on taking another one in the morning if it's negative should I wait four  more days for my peroid or just go on and get a blood test in four more days