I am 22years old, My husband and I feel that we are ready for children Feb the 28 was the first time we have had unprotected sex about a week later I started feeling sleepy and tired,cramps on my lower abdominal and sharp pains in my stomach I have felt a little Nauseous but not to much and a little bit of head aches but not much that's about it though I have no idea when to take a pregnancy test because I know it's a couple days after your miss period but having irregular periods makes that hard since I have no idea when it comes so I took a PT 2weeks after unprotected sex it came out negative then I took one 2days later after that one it came out negative as well then I took one last night 3d week it came out negative to , is their any chance I am pregnant but it's just not showing on the PT?