Could I be pregnant?

My period was 3-4 weeks late and started on may 1st. It lasted for almost 3 weeks. I had a baby this past September but my periods have been normal 28 day cycle the past 5 times since it came back. I'm starting to feel very nausious and I'm having bad mood swings and for the past few days my lower back has started hurting. I took a hpt about a week ago and it was a bfn but I'm thinking it was way too early to test. I need help I'm going crazy thinking about it.

When did you last have sex? If you tell me I might be able to help

You can chat/text/call a women's health professional for free at plannedparenthoodchat.org.

If I'm remembering correctly, an hpt should be accurate within a week of conception.