BFing @ 18mos, 2nd PP period late by 4 days, 2 BFN w/ Sure-Aid HPTs

[decembersky]

I know it's common to have irregular cycles when BFing, but I'm still wondering if I could still be pregnant... With DD1, my periods returned when she was 6 months. We BF till she was 22 months and from that first PP period I was always regular, give or take a day or two.

Well last Wednesday through Friday I had really bad period cramps, just like I had before last AF came. I also had an abundance of cervical mucus/fluid from Thursday-Tuesday(yesterday). It started off really watery; and then by Sunday through Tuesday was just like my mucus plug with DD2. The only I time I ever recall seeing mucus come out like this was when I was expelling my mucus plug for the last couple weeks with DD2. Another strange thing, yesterday morning- I had a spot of pink blood on the toilet paper when I wiped after my FMU. It was maybe a centimeter in size- small, but definitely there. (DH and I DTD the night prior to this spot of pink.) I've also been feeling vaginal aches for the past week...

So I asked DH to pick up a few Dollar Tree tests on his way home last night... and he picked up 2 Sure-Aid HPTs from Big Lots. The box says "Compare to EPT" and it's a pink dye line test. I looked online pretty hard and can't find how much mIU of HCG these tests measure. But according to peeonastick.com, the EPT line test measures 50miU. I took one of the tests with not FMU last night- BFN. I took one this morning with FMU- another BFN.

My main question is whether or not anyone know what the sensitivity of the Sure-Aid HPTs are? Then of course -the impossible to answer question- does it sound like I could be pregnant? (I really shouldn't even bother asking though, because I know what I would say to myself... "Yes it's possible. Retest with FMU in a couple days with a FRER or a Dollar Tree test if AF doesn't show.")

PS- Only form of BC we use is the pull out method... sometimes...