Should I test again?

Regina
I haven't had a period since early February, me and my fiancé do not use condoms or birth control, just withdrawal, and once in March he did not pull out soon enough. I've been nauseous, fatigued, I've had sore breasts, I'm peeing frequently and I'm hungry all the time. All of these are abnormal for me so it led me to believe I may be pregnant. However, I took 3 pregnancy tests in March the first 2 producing negative results but I swore I could see a very faint line on the 3rd test but my fiancé said he didn't see anything? Should I take another test after I've already taken 3? I just don't understand what is going on..