implantation advice?

My husband and I have been trying to conceive for a few months, crossing fingers it will happen soon! This month had a little brown spotting on day 18, which only lasted a day, got a peak ovulation on CD14, 16th June, did the baby dance on cycle day 13,14,15 and 16. Had pretty similar to period cramps on day 18, and this morning and tonight CD 24 I have had this mucous on paper when I wipe. Had a few cramps and twinges today and had pretty bad nausea for most of the morning! Could it be implantation? When could I test? (First pic is last night, second pic is this morning and nothing since)