Thanks for writing in.
After going through the history, it looks like that there are two possibilities.
1] The feeling is psychological. Because you are thinking the same possibility of getting pregnant all the time , so chances of having psychological feelings are more.
2] Miscarrying at early stage.
We can differentiate between two by doing urine pregnancy
test after getting similar symptoms.
If test turns out positive an still if you get periods, means you are miscarrying at early stage. In this case you need to consult gynaecologist for pregnancy support.
I hope I have answered your query. In case of any doubt please feel free to revert back.