Signs that go away

I had some "maybe" symptoms, but the pregnancy ones can be for like 2-3 days then go away?

My boobs felt tender for 2 days, then they were fine, i felt diffrent kinds of abdominal pain and then again is gone after a couple of days. I find it odd for a pregnancy to manifest this way, sporadicaly.

I had sex 2 weeks ago and my irregular period is due in 6/8 days