right last month i was 10 days late for my period i tested and was neg this month i am late again im going out of my mind

i am going to try and get in doctors tomorrow as im paniking that its the worse and i have been doing a test and says neg i deffo got to do something to ease my mind

we hadnt had unprotected sex and yes my period after 10 days last month i then started but before that time we did have sex and he pulled out also was a time that a condom may have split but after 10 days being late i came on then i am 4 days late this month its really worrying me