maybe Implantation Bleeding????

BACK STORY- so i’ve been off of the combo pill “Tri-Sprintec” since January 8th. i haven’t had a period since coming off the pill. My cycles before the pill were somewhat irregular/absent(sometimes) so i have no way of <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a>. i was taking my temp for a few weeks but i don’t have an actual BBT thermometer so it wasn’t truly accurate.

OK- my Fiancé and i have unprotected sex, with withdrawal method (he’s spot on)

so here’s the deal, we had sex on 04/03, well on 04/13 TEN DAYS LATER, i woke up that morning feeling slightly crampy and i had slight lower back pain and just naturally thought, oh wow after 3 months i’m finally getting my period.... So i waited all day and nothing. i was a tiny bit bloated but nothing else other than the cramps and back pain. I went to the bathroom at probably 5pm and i looked at the tissue after i wiped, and i had very light brown discharge on the toilet paper. that’s the only instance that day that i had any discharge that wasn’t the normal whitish/pale yellow. Well then the next day 04/14 rolls around and the whole day goes by until about 4/4:30pm and i go to the bathroom, SAME THING. and then today, 04/15 i go to the bathroom around the same time in the afternoon, i wipe, and it’s the whitish discharge with a tiny line of red blood in it. the tiniest amount. and that’s the only time its happened.

is it implantation bleeding? the timeline would add up IF i was ovulating around the time i had sex and something just so happened to make its way to my egg and get fertilized.... i’ve read that 8-12 DPO is when implantation bleeding occurs. i don’t know if it’s implantation bleeding or if my body is just being weird since i came off the pill 3 months ago and haven’t had a period since.

ANY advice or help?

also to point out, my breast aren’t sore, but they were about 1-2 weeks ago and my Fiancé says they feel bigger but i don’t think they look bigger they just feel more full.

i got up this morning and i had a dizzy spell and i’m nauseous all the time in general, i think i have chronic nausea so i don’t have any super early pregnancy symptoms other than the dizziness. i took a pregnancy test but it came out negative so i figured it was either too early to tell or there wasn’t any potent hcG in my urine since it wasn’t the first pee of the day.

ANY ADVICE OR EXPERTISE WOULD BE GREATLY APPRECIATED ❤️