Very curious

It's always always about your period. Not knowing weather af is gonna appear or not this month. I think I've officially reverted back to be abnormal after the past months my cycle came on time, right my my situation is I'm at least a week late maybe, but very much have thick creamy cervial muscs. And everytime my paretner and I have sex he always says I feel tight, I haven't been doing anything down there to make it differently, no I have no taken a test because it's always another negative, I mean I don't have any other signs that j think would point to pregancy besides the cervial muscs increasing, when it should be drying up because my cycle should be here and also the tightness. Now I will add this last thing I had light spotting on the 15th of this month for that day and it was it, than the next day I had a bit of an upset stomach like it was gonna start and nothing, has anyone experienced something simular or what could you think it be? Could I be pregnant or just late cycle?