Hi, I had unprotected sex in June and still continued getting regular periods. Recently I came across a video about cryptic pregnancy and felt really tensed. Since Monday, I have been having severe stomach pain and random jerks in my abdominal area. However, I did eat all my three meals outside on Sunday, so the reason for stomach pain, gas and frequent need to poop could be that, which has subsided today. But I keep noticing these jerks which also seem to come in either of my legs sometimes. I assumed I wouldn't be pregnant since I have been getting regular periods. But this video and research about it has made me really nervous. Should I go ahead and take a pregnancy test? I read the HCG levels drop in later stages? Please advice. My cycle is 28 days and my last period was on 31st October which lasted for 3 days. In June, i had my periods for 2 days on 13th and 14th and intercourse on 18th.