I know this might be a long shot but here goes. I got my period on july 5th and it ended on july 11th. I went to visit my b/f for 8 days on july 23rd. We had sex every day until the 27th when I got my period again. We had sex a couple times after that. I got home on august 1st. Now its august 16th, about 17 days since I got my period last. Ive had cramping and urination a lot and my back is killing me, also I have sharp stabbing pains in my stomach & sides for a short period. But I took 2 pregnancy tests and they were both negative. I told my bf and he wants a baby. Were both 22. I have more but dont know when to take them or what to do