Period-like cramping is common in early pregnancy; I had it with both my pregnancies. Each pregnancy is different, even with the same woman so just because you did or didn't experience certain symptoms with your previous pregnancy doesn't mean you will or won't with a subsequent one.
Since you have now skipped three periods and keep having negative test results, it warrants a trip to the doctor. They can determine if you are in fact pregnant and if you aren't, they can figure out what is going on.View Thread
If you are using birth control such as the nuvaring, you do not ovulate so a fertility calendar is useless. Since it just fell out during sex, I'd say you're okay as long as you put it back in ASAP.View Thread
I'd say no. Most tests say they are pretty accurate the day of your missed period. There are women that take longer to show on a pregnancy test than others so if your period doesn't show in the next few days, take another test.View Thread
Technically you cannot have a period and be pregnant. A period is the shedding of the uterine lining and if that happened while you were pregnant, it would be a miscarriage. That being said, some women have period-like bleeding during pregnancy they mistake for their period.