I need some help... my fiance have been trying for a baby.. last period I had was on February 13th,…

I need some help... my fiance have been trying for a baby.. last period I had was on February 13th, 2015 ended on March 1st, 2015... started trying on March 23, 2015... started " spotting " I'm not sure.. didn't look like menstrual blood it just got lighter and lighter off and on for 2 1/2 weeks or so.... now today no period but my girlies hurt and I'm cramping and feel like throwing up time to time... my menstruals are irregular idk what's going on with me.... also we would try every 2 days every other day last time we tried was last Tuesday and yes I was spotting during our trying but during... just it would show up next day and be gone...... help me please I took 4 hpt all negative. should I take one this week???? or???