month late 4 negative hpt and 1 blood test all negative?

I had a ectopic pregnancy on February 14 (yea happy valentines day to me) and my doctors told me to wait 3 months and we could try again. after the ectopic my periods were all regular well now i am a month late on my period, cramping in side, very emotional, sore breast and all the above. i have taken 4 hpt and they were negative went to doctor and the blood one was negative too. what could it be? could it be to early

sorry so long just really wanna know thank you
 
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