Hello I Have A Pregnancy Question To Ask? My Last

hello
i have a pregnancy question to ask?
my last period started 22nd of sepetember and ended around the 25th and this month i am 4 days late on my period and i took three pregnancy test 2 days before the day of my period and on the day of my period i took 2 more tests and all were negative i took them cause i was feeling a little off tierd i had few random nausea feelings but they wouldnt last long also i think about a week ago i had very akward discharge in large amounts and very sticky and it lasted about 5 days my breasts are a bit large but i thought that was just pms signs also i had muscle and back pains a week back
since the day of my period i had a cramping but it wasnt as normal as evry month it also came with muscle ach on my shoulders and waist and since then its been very very mild and last 5mins or so

My question is could i be pregnant even thou the 1st 5 tests were negative im 4 days late on my period and havent taken an after period delay test?