thank you for your advise :)
You should go to the doctor. It could've been a miscarriage or you could've just been late and your body is reacting. If your HCG levels aren't high enough, the pregnancy tests can come back negative and when a woman miscarries, those levels drop. If you don't have insurance, try looking for a clinic and make sure they don't just do the pee test; they should do a blood test and exam, as well. It's important because if you suffered a miscarriage, you should have medical treatment. Women can get infections if they go untreated from a miscarriage. But also keep in mind that women go through changes with their cycles throughout their whole lives, so it could've just been related to that. Either way, see a doctor.