I had sex with my bf about a month ago. I had my period a week later. Becoz i m still freaks out, therefore i've took a pregnancy test and it shows a negative result. But my period is delayed for 4 days this month. I took a home test this morning and i've a got ar negative result. But I am still scare. Because I've got headaches, diarrhea, vomited 7 times in a day (that was 3 weeks after sex), lowerback pain.

But I realli don't understand, I've got my period thou. Therefore is it highly possible that i m still pregnant?

3 or 4 weeks

And having diarrha is not a symptom of pregnancy. the lower back pain you get that during pregnancy when your tummy becomes heavy.

So probably you will have your period in the coming 2 weeks.The delay due to your stress.