POSSIBLE pregnancy?

[MarShaylia]

Last full period was April 16-21 what I thought was a period happened May 15-18 (only 3 days) went from heavy (no cramps or clots) (filling 3 pads in 2hrs) (on 15th) to light pink (on the 15th at night) to brownish colour (16th-17th) to pink & clear colour (18th) & then absolutely nothing. Usually my period last 5-7 days never (never) has it gone off before time. I have 3 kids and this the first I've seen this.. now before I noticed the blood I noticed my nipples are darker and has spread & are tender to touch, feels heavy at times. also now im gassy lower back pain and just feel like I don't have any energy at all.. is it possible to be pregnant or am I tricking myself? I've been trying really hard not to think about it or even speak to my husband about it because we've been trying and he's getting impatient thinking we cant have anymore lol and I'm a little sceptical because I'm tired of peeing on a stick and it's negative so we haven't tested yet. Fingers crossed. We want one more.