Late Period

Di

hello this is the first time i am posting. I am late 3 days for period and i check pregnanxy test and it is negative . i have very very light spotting yesterday and today and also i have mild cramps only sometimes. Generally my periods are very regular and i can feel more cramps before one or 2 days of my period and no symptoms of period till now.

And last month we tried to conceive . please suggest what should i do next?