Unprotected sex, cramps, now a brown mucus

Hello so me and my fiancé have been together for 4 months now and we had not had sex til the 6th June (d day) as this was our 4 month anniversary and I was on my period ( not a nice feeling) during sex I asked him if he had ejaculated or not he replied with no not yet, I found out a few days later he did but he didn't want to tell me, so we stopped then as I had cramp in my leg. When we finished I pulled the cover to find I had bled a lot on the bed, he had gone to get ready for work and when he left I cleaned up it had gone through the sheet and stained the mattress so it had to be a lot, I saw no sign of semen to suggest pre ejaculation, anyways the next day I stopped my period which is weird as it normalised itself as I had a contreceptions shot over 6 months ago with a previous ex but I research it and it said it takes atleast 3 months for the hormones to come out of your system, I did have unprotected sex with mu ex when i was with him but I took a test which came out negative, so the same day I came off my period (7th June) I had a bit of cramping which lasted about 5 mins I just assumed it was period cramps still as implantion cramps take up to 10 days, this was still at the back of my mind, but today I had more cramping at work and I felt like a gush feeling downstairs so I ran to the toilet thinking it was more blood ( which could've been more of my period) but when I looked it was just a bit of brown mucus, which left me confused i did some more research a few days ago which says your cervix would have been lower for a period and gone higher up when you had finished or was pregnant and would've gone soft if you was pregnant, when I felt my cervix it was quite high up and didn't feel like the tip of my nose, I've had no more mucus for the whole day and it's left me confused of if I am pregnant or not I really wish I am as I've been broody for quite sometime and I would love to have a family with my partner there is no more sign of that brown mucus in my vagina anymore so I was wondering if anyone could help, I think it might be too early for a pt and I don't wanna waste money on one, I am going to the doctors next Thursday as I have a cough an have done for nearly 2 weeks so I'm gonna go get checked out then but no sure wether they could do a blood test really hoping someone on here can help me out a bit just don't wanna get my hopes up Thanks sorry for the TMI