Should i go to the doctor???

I just had a baby in September, I'm not trying to conceive but idk. AF was due May 4th still nothing. Took a pregnancy test about two weeks ago and it was negative. Should I see my doctor or just wait for it. I had all the signs that she was coming (cramps, bloated, bitchy mood, and pimpels) but never showed now I feel nothing no sign of her at all. I get light cramps but nothing unusual. Its nothing like how I felt for my last two pregnancies.

No I'm not on birth control